As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
RIGHT PACK LIGHT ON DURING PREFLIGHT. DID NOT EXTINGUISH WITH RESET. ACFT GROUNDED. PERFORMED PACK CONTROLLER BITE CHECK, FOUND PREVIOUS FAULT FOR PRIMARY TEMP CONTROLLER. CLEARED FAULT BITE CHECK NORMAL. PRIMARY TEMP CONTROLLER ALREADY ON MEL. VERIFIED MEL OPERATIONS NORMAL ACFT OK FOR SERVICE REF AMM 21-61-00-700-811-002.