As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: CA REPORTED AN ACRID SMELL. WHEN QUESTIONED, FAS REPORTED STRONG ODOR BURNING WIRE IN THE CABIN. ALL FAS SOUGHT MEDICAL ATTENTION IN CLT DUE TO HEADACHES. PILOT REPORTED SMELL OF BURNT OIL ON TAKEOFF THROUGH CLIMB OUT, CLEARED AT CRUISE. MAINTENANCE FOUND THE APU OVER SERVICED AND THE OIL TEMP SEAL LEAKING. REMOVED AND REPLACED THE OIL TEMP SEAL IAW AMM. LEAK CHECK GOOD.