L322's are rather prone to going haywire if the battery volts go "low" and they then report all sorts of crazy problems that don't really exist.
Either, put a new and good battery on it OR attach a charger capable of a "supply mode" and clear all faults with an appropriate diagnostic reader and see if anything immediately pops back up.
Also, L322's tend to get "damp" in the very areas chosen to house a lot of the electronics and so corrosion on connectors etc. also has a large part to play. Are the rear cubby areas damp/wet, is there any signs of corrosion on any of the units in the cubby's?