As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: FLIGHT CREW REPORTED STRONG DIRTY/MUSTY ODOR UPON ENTERING AIRCRAFT. HEADACHE SYMPTOMS REPORTED BY CA FOR FLIGHT AND CABIN CREWS. NO MEDICAL ASSISTANCE NEEDED. MAINTENANCE ACCOMPLISHED CARD 26L00021001. FOUND APU TO BE THE SOURCE (INTERNAL OIL LEAK). APU CHANGE DECLARED.***SUPPLEMENTAL INFORMATION: MAINTENANCE REMOVED AND REPLACED THE APU IAW 26L31049003 AND C/W APU WASH IAW AMM 49-00-00-100-003-A. OPS CHECK AND LEAK CHECK GOOD.***(CLOSED)