I just had mine show CEL, VSC and VSC OFF with coder P0441, O0442 and P0446. All codes related to the Evap system.
Found the gas cap loose, tightened it, cleared the codes. No problem now. I'm glad I didn't waste time at the dealer.
Sorry,
Your mod thread never actually showed how the fronts were wired (unless I missed it! :doh:)
I will ohm the elements before I buy the heaters for sure.
Thanks