As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: STRONG ODOR COMING FROM VENTS WITH APU BLEED SELECTED. REPLACED APU COOLING FAN (AALA202107142127) PER AMM 49-52-51 AND APU OIL COOLER (AALA202107141129) PER AMM 49-91-44. A SATISFACTORY LEAK / OPERATIONAL CHECK WAS ACCOMPLISHED.