As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING MASTER CAUTION RECALL, AIR COND, MASTER CAUTION, AND LEFT PACK LIGHT ILLUMINATED. LIGHTS EXTINGUISH UPON NEXT PRESS OF MASTER CAUTION. GROUNDED - YES. REF B737-800 AMM 21-51-00 #1 PZTC FFR SHOWS "TCV THIS PACK" FAULT. RESET FAULT. FAULT DID NOT RETURN- BITE TEST #1 PZTC GOOD. FUNC CHECK LT PACK GOOD. CLEARED MEL 21-32B.