As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED. ON INITIAL CLIMBOUT STRONG ODOR OF ELECTRICAL OR DIRTY SOCK DETECTED IN FLIGHT DECK AND REPORTED BY FLIGHT ATTENDANT THROUGHOUT CABIN. SLIGHT DISSIPATION ABOVE 10000 FEET. DECLARED AN EMERGENCY ODOR REOCCURRED ON RETURN DESCENT INTO AIRPORT. MAINTENANCE FOUND APU LEAKING OIL FROM GEARBOX PLUG OPPOSITE OF COOLING FAN. REPLACED APU PER JOB CARD 26L31049003.