As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CREW REPORTED AN ELECTRICAL SMELL IN FORWARD HALF OF A/C BOTH WITH EXTERNAL AIR AND APU AIR. MAINTENANCE PERFORMED J/C 26L00021001 AND FOUND PSU TRANSFORMER AT ROW 3A/C OVERHEATED. PER AMM, REMOVED AND REPLACED PSU IAW AMM 25-25-11-000-001A. PSU AT ROW 3A/C OPS CHECK OK.