Hello, i work for a company that now uses crown lifts but we have 1 dss300 from the mid 90s. This lift was working fine but started giving me code fg (check battery) when using the side shift or tilt. So i just used them as little as possible. It would also occasionally give code 45 and 4A. I would just restart and go on my way. Then code AG started. Was a total pain but after 20 or so starts it would work. Now it is giving code A0 SHUTDOWN and will not run. The maintenance dept checked it for loose connections but couldn't find anything. They do not want to call in anyone due to its age but are open to fixing it ourselves. Any advice would be great. I'm trying to save it from the scrapyard.