As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER ENG START AND BOTH PACKS TURNED ON AND RECALL OF MASTER CAUTION PUSHED "ZONE TEMP" LIGHT ON "CONT CAB" CONTROLLER ILLUMINATED. "MASTER CAUTION PUSH TO RESET" WOULD EXTINGUISH LIGHT. QRH "ZONE TEMP" PROCEDURE RAN AND MAINT (SEA) CONTACTED. REPLACED CONTROL CABIN TRIM VALVE (V143) OPS CHECKED NORMAL & LEAK CHECKED GOOD REF AMM 21 61 21.