As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PROBLEM: THE FLIGHT CREW REPORTED " BURNING SMELL COMING FROM ACS SYSTEM". RESOLUTION: MAINTENANCE WAS DISPATCHED TO THE AIRCRAFT, THE FOLLOWING ACTION WAS ACCOMPLISHED " VISUALLY INSPECTED ACS DUCTING AND CLAMPS AND ENGINE COMPARTMENT. NO DEFECTS NOTED. RAN AIRCRAFT AND HEAT FOR 10 MIN IAW AMM 12-B-71-00-00-00A-903S-A. OPS CHECK GOOD. NO SMELLS. THE AIRCRAFT WAS RELEASED.