Oh yes, the T90 has its fans. I was one of them. It's an all-electronic, multi-drive wunderkind and a CLA would be an involved and likely expensive undertaking (e.g. something costing much more than the net worth of the camera). One major servicing issue is that of replacing the lithium button-cell battery inside, failure of which often causes the EEEEE error message on the display. Long before now this battery would require replacing in the majority of T90 bodies, and is a service bench (not DIY) job. It involves a lot of disassembly of the top, access to and under circuit boards, unsoldering, replacement and resoldering and recalibration of electronics (especially if the battery has been dead for years). I'd like very much to rekindle my 1980s, 3-year association with the T90, but an awareness of reliability issues and faults that point to the battery issue pretty much turn me off. Your first check of a used T90 would be the camera's routine operation (checking for noise, jamming mirror and/or shutter, winding irregularities) and the display — the oft-lamented EEEEE cryptically points to a fault "somewhere" (either passive or critical/fatal), and that could be incorrect film loading or rewinding, a shutter problem, the aforementioned battery service requirement, any one or more of the motors... who is to know? There are quite a few T90 bodies on auction sites. I think your best bet would be to buy one that has been fully serviced and tested, but by eye or ear (not "shutter sounds OK, shutter speeds seem good..."), but the complete technical internal/external servicing, testing and calibration.