I have a 10 year old Trane XL 80 that leaks from the metal box above the heater while running the air conditioner. I haven't been able to find exploded diagrams or service or installation manuals for troubleshooting purposes. A friend of mine said he basically had the same problem and that it was a clogged filter in the condensation line and a contractor helped him over the phone. Any ideas? I'd like to fix it myself if possible.

We are all volunteers. Please give us a chance to answer - don't keep posting the same question.

I didn't intend to post it twice I was interrupted in the middle od posting and accidentally posted it again. Sorry about that!

It happens - I'm surprised no one has come along.