As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FA REPORT AIRCRAFT CABIN FREEZING COLD DESPITE AFT CAB AND FWD CAB TEMP CONTROLS FULL HOT - TEMP INDICATES 22 DEGREES C FOR BOTH DUCTS. GROUNDED - YES. BITE TEST ON BOTH PACK-ZONE TEMP CONTROLLERS SHOWS NO FAULTS. RAN BOTH PACKS FULL HOT, CONFIRMED FWD CABIN & AFT CABIN TEMP SHOW 22 C. CONTROL CABIN TEMP OK. GVI BOTH PACKS, FOUND R/H PACK TCV2 (V141) OVERHEATED. REMOVED & REPLACED TCV2 REF B737-800 AMM 21-51-10, LK CK & OPS CK NML REF AMM 21-61-00-700-806-002. RECHECKED AFT & FWD CABIN TEMPERATURE, NOW SHOWS 35C.