As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT ARRIVED WITH CAPTAIN REPORT 'DEFICIENT AIR CONDITIONING'. DURING REVISION THE LEFT TURBINE COOLING WAS DAMAGED. REPORT WAS DEFERRED IAW MEL 21-1, LEFT AIR CONDITION OUT SERVICE. DURING OVERNIGHT SERVICE THE LEFT TURBINE COOLING WAS REPLACED IAW MM 21-51-01, ALL TESTS CORRECT. (M)