Trying to fix a discontinued microfilm reader

I scored an old floor model of a Minolta RP605Z microfilm reader/printer. The vendor swears it was functional when it left him (but gave me a partial refund). The freight company insists nothing happened in transit. But we get an error message that says there's a "defective optical system." The manual just says to call a technician. Minolta says of course they don't know who could work on this machine. A Minolta-related company said they'd put the word out but I've gotten no replies. I can't believe I've had an easy time in the past finding help to fix a 1930s sewing machine and a 1940s typewriter, but there's no old timer out there who could just take a look? How does one find expertise on older systems?