As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LEFT PACK WITH MASTER CAUTION ILLUMINATION AROUND 10,000 EXECUTED QRH. LEFT PACK LIGHT EXTINGUISHED FOR APPROXIMATELY 10 MINUTES THEN REILLUMINATED. REACCOMPLISHED QRH CLOSED ISOLATION VALVE AND LEFT PACK OFF, PER QRH. GROUNDED-YES. RESOLVED ON W/O: 1856553 TASKCARD: N/R-00008. REMOVED AND REPLACED LT TCV, REF B737-900 AMM 21-51-10. OPERATION CHECK GOOD. NO LEAKS FOUND, BITE CHECK GOOD. THIS CLEARS MEL 21-33D. PLACARDS REMOVED. SEAMC FELIX NOTIFIED.