What was found
AIRCRAFT WAS GROUNDED: PILOT REPORTS BAD ODOR ON AIRCRAFT. STRONG ELECTRICAL, FUEL, AND OIL SMELL IN THE CABIN. ODOR AFFECTED DHD CREW MEMBERS WHO SOUGHT MEDICAL ATTENTION. SYMPTOMS EXPERIENCED CONSISTED OF DIZZINESS AND HEADACHE. MAINTENANCE REPORTS DURING ACCOMPLISHMENT OF CARD 26L00021001, AN OIL LEAK WAS FOUND ON APU LOAD COMPRESSOR DRAIN TUBE. APU COMPARTMENT WAS CONTAMINATED WITH OIL. MAINTENANCE REMOVED AND REPLACED THE APU IAW JOB CARD 26L31049005. OPS CHECK GOOD. NO FURTHER ODORS NOTED.