As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
L PACK LIGHT ILLUMINATED IN FLIGHT. DID NOT GENERATE MASTER CAUTION. GROUNDED - YES. LH PACK CONTROLLER HAS HARD FAULT - TCV FAIL. CHECKED AND RELEASED PER MEL 21-33D. R/R L/H PACK TEMP CONTROL VALVE PER B737-900 AMM 21-51-10-400-801. TCV INSTALL TEST GOOD, LEAK CK GOOD. FAULT CLEARED. THIS REMOVES MEL 21-33D.