As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LH PACK OVERHEAT AND INCREASING TEMP PERFORMED QRH NO HELP. AICRAFT ATB TO CVG AND WAS GROUNDED BY MAINTENANCE. INSPECTED MEL PROCEDURES FOR DI 34798 PROPER MEL PROCEDURES WERE IN PLACE. INSPECTED HEAT EXCHANGERS AND ALL DUCTS FOR BLOCKAGE OR LEAKS NO DEFECTS. CHECKED TRIM AIR SUPPLY CHECK VALVE FOR HEAT ON RH SIDE NO DEFECTS. REMOVED AND REPLACED LH PACK FLOW CONT/SOV PER B767 AMM 21-51-01 OPS/LEAK NORMAL. RE-APPLIED MEL 21-51-2 AC IS NO ETOP. AIRCRAFT RETURNED TO SERVICE.