I tried to look the model number you provided, up on Airexcel's support pages. Said "Discontinued" like ours from 2002 does, and provides a replacement model number. Difference was, I could still access the parts list for ours. There were no "Documents" available for yours.
Many will say you're on borrowed time with a 1997 A/C. The last Coleman we had was from 1983 and we sold the coach in 2008 with it still running. Ran well, actually. I thought I'd have to replace it but all I did was clean it per Chris Bryant's thread on it, and it cooled well again. So, some of those units run a lot longer than we give them credit for. On the old one, I didn't repair or replace anything on the unit itself. Cleaned it, changed filters, oiled the motor. Moved a couple wires that were rubbing, replaced the shroud. That was it.