As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
RIGHT PACK LIGHT CAME ON DURING RECALL CHECK. LIGHT DOES GO OUT ON PUSH TO RESET. GROUNDED - YES. PZTC BITE SHOWS "TCV THIS PACK" REF B737-800 AMM 21-61-00. REPLACED THE RIGHT PACK TCV PER AMM 21-51-10. LK AND OPS CK GOOD. ETOPS GROUND VERIFICATION SUCCESSFUL.