As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CREW COMPLAINED OF LIGHTHEADEDNESS DURING LEG FROM ATL TO BWI. ACRID SMELL IN AIRCRAFT WITH APU AIR OPERATING AT GATE. MAINTENANCE OBSERVED A SMALL AMOUNT OF OIL DRIPPING FROM LEFT APU DOOR PANEL AND THE APU INLET DOOR CONTAMINATED WITH SOME OIL. MAINTENANCE PERFORMED A PNEUMATIC SYSTEMS DUCT BURNOUT PER OPERATION 5089. NO OIL LEAK. PNEUMATIC SYSTEMS CHECKS OK. (2010-D1279)(DLM88102942)