Korg T2 Work Station Weird Sounds

I have an old Korg T2 which has started making weird electronic sounding notes with very long sustain. I am new to this machine and I don’t know if this is a programming issue or a faulty board or hardware. All pre-loaded voices sound the same - like bad sci-fi effects. Does anyone have any ideas or suggestions?

Look at page 33 on for power on tests and initialization proceduree. Of service manual below.
Here is a great synth manual link for you
Korg T2 Music Workstation | SynthXL - Service & Repair Manual
Hope this helps you now and in the future please pass the synthxl.com resource along to others trying to service and use old synths.
Have fun