As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
TERRIBLE SMELL IN COCKPIT AND CABIN. SMELL GONE WHEN APU BLEED OFF SO DEACTIVATED APU BLEED INOP. ELECT OK. INBOUND CREW STATES PACK BURNOUT PRIOR TO DEPARTURE. SMELL STILL PRESENT BUT LESS INTENSE THROUGH CLIMBOUT. SMELL DISSIPATED THROUGH CRUISE & RETURNED ON APPROACH AT 3000 FT. REPLACED APU. ACCOMPLISHED SUCCESSFUL ALTITUDE VERIFICATION START ON ACCOUNT OF APU REPLACEMENT.