Luckily previous owner supplied a bunch of oem stuff including PHH parts. I had cylinder leak down and bore scoping done since I don’t own any of that equipment anymore. (Moved on from auto tech to biotech)
12% leak down and no abnormal wear...
Aside from the standard fluid changes here are a few things to look at:
Inspect rear heater hoses/pipes and remove/replace if rotten
Check "Pesky Heater Hose" and replace if it still looks factory
Front axle overhaul (new bearings and seals)...