As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
REFERENCE LOG PAGE LP1275501 ITEM 1, BURNING WIRE SULFUR OIL SMELL IN FWD CABIN AND COCKPIT FROM AIR START TO TAXI BACK TO THE GATE. PERFORMED MIN. IDLE LEAK CHECK WITH ENGINE BLEED AIR OPERATION. REF. AMM 71-00-00-710-006-B. PERFORMED CABIN ODOR CHECK WITH PACKS OPERATING. REF. TSM 05-50-00-810-831-A. NO DEFECTS NOTED AT THIS TIME.