As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
REPORTED BY PILOT OF A SMELL OF HOT ELECTRONICS FROM COCKPIT. PILOT RAN BLEEDS FULL HOT AND THAN COLD, ODOR DISSIPATED. SUSPECT NEW DUCTING INSTALLED AT RON TO BE SOURCE. CURRENT LEVEL OF ODOR IS ACCEPTABLE TO CREW. NO ODOR WITH BLEEDS OFF. FLIGHT DECK AIR CONDITIONING MODIFIED PER FCD8-21-09-0180 TO RELOCATE CONDITIONED AIR TO SIDEWALL GASPERS. NO DETECT NOTED AT THIS TIME.