You seem incredibly knowledgeable and super up there on your crossfire pedestal Pizza guy. You cost me $200+ telling me it was the RCM and are throwing in the towel super early cause the issue doesn't fit your mold. You are by no means an expert (even if you have three roadsters you beat off in.) You need a complete vehicle history in order to help? What a joke bro. You should open up a shop with my neighbor "mechanic" 😂

Next step is to yank all aftermarket and follow with a drb III tool like the manual says. Reading through schematics it looks like a bad ground or faulty instrument panel is the most likely issue. the CAN system could need the reboot like so many other computer systems. At least that's what the manual says. I plan on looking through slk forums and manuals to see if anything turns up.

Drb 3 alternatives would be great if anybody knows any software.

There are tons of other groups on Facebook I can take the issue to as well.

Any suggestions would be greatly appreciated and followed. (Unless you hump pepperoni's. Then go get a complete history.)