As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WITH MASTER CAUTION RECALL: # 2 PACK LIGHT REMAIN ON AFTER MASTER CAUTION RESET BUTTON PUSHED. GROUNDED - YES. CONFIRMED FAULT, BOTH #1 & #2 PACK-ZONE TEMP CONTROLLER BITE TEST FAILS TCV 2 (V141), WILL NOT RESET FAULT. FOUND TCV 2 FROZEN. REMOVED & REPLACED TCV 2 (V141) REF B737-800 AMM 21-51-10, LK CK & OPS CK NML REF AMM 21-61-00-700-806-002. RAN BOTH PACKS ON APU, GROUND FUNCTIONAL CK NML. AIRCRAFT RELEASED FROM MEL 21-1F.