Personally I don't think sealing the bolts will stop the leak. I will update the results as I am taking it up the line on road 12 hour drive then back.
I just checked the torque it's tight to spec. I pull them out one at a time put some red red loctite 510 and torque it back up to 115NM . The bolts are very slightly bent I believe it's under so much stress. And you are 100 percent right at some stage the diff has to be split open to reseal...
It has never been pulled apart only work done was right side drive axle seal. But I will check the torque thank you very much for your advice really appreciated.
Me too can't understand why it just started leaking it's parked in my garage most of the time as I am so busy hardly ever take it out occasionally switch into 4 wheel drive to work out the actuator as another horror stories I hear the actuator start to play up.
So I found the leak the engine cove was wet I removed the engine cove to see where the leak was coming from gave it a good clean left it over nite took it for a short drive around the block and as per photos telling the story maybe I drove 5km max.
I checked the oil level was below the fill plug but not too low I think it must just started happening . Good point not to try taking them bolts out . Any suggestions or shall I just take a hit and take it Toyota dealership but I hate taking it to Toyota 1st they too expensive 2nd they don't do...
I am bit worried with heat driving long distance maybe get worse and I lose lots of oil while driving and ruin my front diff. I was thinking of taking one bolt at a time put some gasket sealant and do them up .