As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT NR 2312 - SMELLED BURNING ODOR 20 MINUTES AND 5 MINUTES BEFORE LANDING. NO SMOKE OBSERVED. FLT ATTENDANT SMELLED IT FIRST IN FWD CABIN. INSP COCKPIT AREA OVERHEAD PANELS, SIDE WALL PANELS UNDER COCKPIT FOORS RAN BOTH ENGINES AT MAX POWER WITH ENGINE BLEEDS ON. INSP LEFT/RIGHT RELAY SUPPORTS AND LEFT/RIGHT WINDSHIELD HEAT CONTROLLERS AND LEFT/RIGHT DISTRIBUTION CONTACTERS BELOW FLIGHT ATTENDANT SEAT. NO FAULT FOUND.