I just had my oil changed and the technician told me I had a leak from my oil pan, transmission, and my rear differential. I'm wondering what I should do to find the leaks and repair them? Any advice would help.

 

Sounds like your lube tech already spotted them for you. It's an old car, they leak. And...the oil pan, transmission are the big three. If you are hiring your oil changes to be done, repairing the leaks may be a bit daunting. The oil pan leaks , generally, as a result of the oil pan gasket failing. The transmission leaks becasue of gaskets and seals failing...ditto the rear end. If you are not leaving enormous pools everywhere, I'd just monitor the fluid levels.