AC on the fritz again

[KevinC]

Last year my AC started blowing warm on one side, which is a symptom of needing a charge. Sure enough, had my indy check it out and he added R134a, and all was well. Well, until now. It's just starting to heat up again here in Phoenix, and today I have the same symptom. So apparently I have a leak someplace.

What kind of repair am I looking at, and what is it likely to cost? This blows (warm!)!

[ELCID86]

Evac/Recharge with dye just ran me $230. Need to take it in on a "hot" day so the pressure builds enough that leaks can be detected--might not be an issue in AZ! (I did not and have to go back as they didn't find a leak).