As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GNDED, FLIGHT ATTENDANTS REPORT VERY STRONG ODOR, MUSTY SOUR SMELL, FROM MID CABIN AFT THAT BEGAN DURING TAKEOFF ROLL DIMINISHED DURING CLIMB THEN INCREASED DURING DESCENT. ACCOMPLISHED CARD 21-96-01 & FOUND AN OIL LEAK AT THE APU LOW OIL PRESS SWITCH B NUT. TORQUED B NUT IAW AMM STANDARD PRACTICES & ACCOMPLISHED LEAK CHECK. SYS CHECKS NORMAL.