As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING TAKEOFF AND CLIMBOUT. FLIGHT ATTENDANT COULD SMELL A BURNT RUBBER SMELL THROUGHOUT THE ENTIRE A/C. IN THE COCKPIT IT SMELLED LIKE A PETROLEUM PRODUCT OIL OR HYDRAULIC FLUID. IT SEEMED TO DISSIPATE AS WE CLIMBED OUT AND REDUCED POWER / FOUND OIL AROUND AND IN APU COMPARTMENT. T/S IN REF TO AMM TASK21-53-00-720-802. CHANGED SOCK IN REF TO 21-54. C/W NO GO ODI PREVENTION.(4633310)