As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
UPON RECALL, MASTER CAUTION LIGHT AND LEFT PACK LIGHT ILLUMINATES. GROUNDED - YES. PERFORMED LH PFTC BITE. FOUND LH PACK TCV FAULT REF B737-900 FIM 21-62 TASK 801. REPLACED LH PACK TCV PER B737-900 AMM 21-51-10. INSTALLATION TEST PASSED. NO LEAKS.