As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHILE PARKED ON THE RAMP, NOTICED BURNING ODOR IN COCKPIT. MECHANICAL FRICTION ODOR WITH SOME BURNING OIL. NOTICED THAT COCKPIT PAC SUPPLY TEMP WAS VERY HIGH, APPROX 220 DEGREES WITH A COLD TEMP SELECTED. REMOVED DEFECTIVE COCKPIT ACM. INSTALLED REPAIRED ACM. OPS AND LEAK CHECKED GOOD. WORK PERFORMED IAW MM 21-50-00.