If you are going to pay to had leaks fixed you should look into having a shop or yourself add a die to the oil and look at the leaks with what ever light source they use to detect the die. Have not tried doing it myself but may shops will do it. Not sure how much better it is than power washing the oil and looking for leaks.
Post up the pic.
How much oil do you leak? If its just drips I would just try Rotella T6 or a swell sealing oil (high mileage oil) or maybe a swell sealing additive (not sure how well they work). It get costly to drop trans to replace the seals. If you do drop the cash, make sure you pick a shop that knows to replace the seal and reseal the retainer. Might be good to change the PHH at that time too.
this is the best I could for pics for now, what do you think?