The error codes are listed in the service manual. I have a list of some of the errror codes. You can buy brand new jukebox manuals (and parts) from
www.victoryglass.com The Victory Glass part numbers for the manual you need is:
70-5769 (R-559) Rowe-Ami model R-92 Field Service and Parts Manual, 184 pages! ($39.95). Worth every penny!
If you'd like (or need) to pay less money check out ebay seller jeffwager and his manual selection.
This jukebox uses Rowe # 6-09931-02 (a.k.a. 60993102) 130 watt amplifier (65 watts per channel). If your box is missing the amplifier, I have an extra rebuilt tested ready-to-go amplifier for your machine. Shoot me an email at KLayton888@aol.com
BTW, the R-92 is great sounding and dependable running machine. The jukebox is old enough now that the battery for the memory in the Central Control Computer (CCC) is probably dead/weak and needs to be replaced. It's a lithium 'coin' style cell and it's soldered in.