Startekinfo is only available to those with credit cards with US billing addresses from what I understand. Try it and let us know what you find, it will have a full diagnostic manual with code explanations and diagnostic test procedures for all your systems. It may not have wiring diagrams for a 124.

I would clear the codes and work on the first code to come back. I generally ignore CAN codes unless they are in more than one module or are continuous. I also tend to look at the general condition of the battery on CAN codes that are intermittant. The control units quit talking at voltages below 9v and a weak battery might get a moment in the high 8v and still sound like it is starting OK.

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Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician