leaky tiki diff-eriki
diffs can leak on the rear cover, usually just a flat gasket there
They can leak at the drive flange(s); just a regular seal there, no need for fancy tools but the nut holding the flange on, may be large and I suggest you have a 1/2 inch impact handy or available.
Could also be a leak at the drain hole or fill port. Both take a crush washer...? No biggie there either.
Nothing to really get into a sweat about.
UNLESS the leak is at the input end. Even then you may be able to extract the seal, dunno, haven't looked there.
Question is, WHY did it start to leak? this is not usual.