As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ZONE TEMP, CONTROLLER CABIN ILLUMINATED UPON RECALL ON DESCENT. ACFT GROUNDED. RIGHT PZTC LOGGED, FLT DECK TRIM VALVE FAULT. COULD NOT DUPLICATE MALFUNCTION. VERIFIED INSTALLED TRIM VALVE WAS A -5 PN. VALVE PASSED NUMEROUS BITE CHECKS. RAN PACK FOR 45 MINUTES WHILE VARYING SELECTED TEMPERATURE. UNABLE TO GET VALVE TO FAIL. ALL CHECKS NORMAL REF FIMS 21-62, TASK 832 & 842.