[LMSenus]

On Friday, we caught my truck in the act of displaying the "Service 4WD" light again and took it directly to the mechanic. It threw a 2725 (?) code indicating a problem with the 4WD switch. On Sunday, we took off the kick panel and inspected the TCCM -- no water damage, nothing loose, corroded, or otherwise a problem. The switch, however, is not functioning normally anymore. Planning to replace the switch.

We'll dig into the other problems this coming weekend. We're doing a general tune-up and will address the TPS issue then. Still not sure what to do about the EBCM relay error...