As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SMELL OF SOMETHING HEATED ODOR AT GATE PRIOR TO PUSH BACK REPEAT WRITE UP FROM PREVIOUS 2 DAYS-C/A-REMOVED AND REPLACED R/H AIR CYCLE MACHINE IAW AMM 21-51-03. OPS CHECK GOOD IAW AMM 21-51-00. REMOVED AND REPLACED GASPER FAN IAW AMM 21-23-03. OPS CHECK GOOD IAW AMM 21-20-00. NO MORE EVIDENCE OF SMELL IN COCKPIT OR IN CABIN AFTER RUNNING BOTH PACKS AND GASPER FOR 45 MINUTES. RECIRCULATION GASPER FAN P/N 4611028900 S/N 02077 AFT