Paint Marker it is! Where do I pick them up, Wall Mart, arts & crafts, auto parts store.?
Tape is interest idea. But with grimy gloves on, I see that slowing me. Also I'm pressed for room in my tool boxes, shop and storage, even my tape draw is packed. That's not and option for me at this time. I need a bigger shop for even one more tool, and I've so many on my wish list now..
As I've opened my shop up to those in mud this last year. I've learned the issue of improper repairs is much more wide spread than I imaged.
Anyway this was and interesting diagnostic and repair exercises. I was so happy when it fired up.

I'll put it up with one I'm the most proud of, that was just diagnostic. Inoperable A/C, that so many differ Toyota Dealerships (5 IIRC), A/C specialist and shade-tree mechanic try and failed to get it working.
Water entry was the cause of this one:
So a local mud member (a mechanic) brought me his clean 04LC w/157K miles, for diagnostic of inoperable AC. He had it at Toyota Dealership which told him to start by replace AMP ((NAV unit). He declined as he's done that! In researching Toyota Service History, he found PO had it in Toyota...
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I had one other leaky windshield last year. Where windshield wipers would come on automatically in snow and rain storms, and not on demand with the switch. It was pre auto rain sensing and again due to water entry. I never wrote that one up.
I've two now that I've not written up. One is a interesting brake issue the other CATs. I'm learning a ton on these two, I hope/plan to share in mud!
So far about every interest case that the forum has help me with and been a part of diagnosing & repair. I can point to either improper PM or the wrong procedure during service itself.
So many have no idea, when they drive away from any shop. Damage has been done or being done as they drive. Error happen even in rock ships, we're human and make mistakes. But some of these shop are taking advantage of the uninformed, and some our messing up our rigs for negligence.
Some of these shop are just crooks.
@Ali FJ80 had made mention of a local shop near me in the 200 section, ToyLex. Last year I had one of their timing belt job in my shop. I noticed oil from front weep hole. These SOB salted an oil pan bolt with oil, when client bough back in to them to inspect the oil weep. He had two other shops mess stuff up the same years and one didn't correct or inform, a brake rotor issue.
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Here's one that been in multiple top shops in the area, for PM. Owner did everything right. He wanted the best for his rig. They missed the mark badly. This one was headed for for big trouble within miles. He'd been lucky if spark plug blew out the head, which it was about to. Because his engine was head for certain overheating.
As many of you know, my hobby is to inspect and work on 100 and 200 series. Late last week while I was waiting on brake master cylinder. Another local with an 05LX w/147K stopped by. He doesn't wrench and has been taking his rig to a local Toyota specialty shop and Lexus Dealership to get all...
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I'm learning everyday and I make mistakes. But I take my time a strive to get better daily working on these 100 series. I do have the advantage of specializing on 100 & 200 series. So I'm not having to learn other makes and models. It why I can see things other miss.
Some use the term OCD. No, it's workmanship and pride in a job well done.
Above all else, I feel integrity and honesty is of the utmost importance.