As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
RT PACK LIGHT ON UPON MASTER CAUTION RECALL LIGHT EXTINGUISHES UPON MASTER CAUTION RESET. GROUNDED - YES. REF L/P 11972111, TCV 2 (V141) FAILED BITE TEST. REMOVED & REPLACED TCV 2 REF B737-800 AMM 21-51-10. ACCOMPLISHED PACK-ZONE TEMP CONTROLLER BITE TEST REF AMM 21-61-00-700-806-002, OPS CK NML. ALSO, RAN BOTH PACKS ON APU, GROUND FUNCTIONAL CK NML. MASTER CAUTION RECALL PRESSED NUMEROUS TIMES, RT PACK LIGHT DOES NOT COME ON. AIRCRAFT RELEASED FROM MEL 21-32B.