As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHEN INCREASING HEAT IN THE MANUAL MODE FOR COCKPIT, THERE WAS A PROMINENT OILY RAG ODOR UNTIL TEMPERATURE LOWERED. NO SMOKE, JUST THE ODOR OF OIL. COMPLIED WITH CLEANING OF THE COALESCER SOCKS. RAN APU AND OPS CHECKED CABIN AND COCKPIT ACM WITH NO ODOR OR DEFECTS NOTED AT HIGH TEMP. WORK DONE IAW MM 12-18-01-160.