As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT RETURNED TO THE GATE WITH A STRONG ELECTRICAL SMELL COMING FROM THE RIGHT AFT SIDE OF CABIN. AFTER INVESTIGATION FOUND WATER COMPRESSOR VERY HOT AND NOT OPERATING AND CAUSING SMELL TO GO INTO GALLEY VENT FANS SPREADING THE ODOR THROUGH OUT THE AFT CABIN. REPLACED COMPRESSOR.