As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON CHECKLIST RECALL, OBSERVED "PACK" ANNUNCIATOR LIGHT. ACCOMPLISHED AIR SYS PACK LIGHT QRH, PG-2.7 PROCEDURE. AFTER STEP 2- BOTH PACK LIGHTS REMAINED EXTINGUISHED. ACFT GROUNDED. PERFORMED PACK/ZONE TEMP CONT BITE TEST. PREVIOUS FLT SHOWED RT PACK TCV FAULT. NO CURRENT FAULTS. TEST PASSES WITH GREEN GO LIGHT, REF FIM 21-62, TASK 801.