As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
MKG - FLT NR 4108 - ELECTRICAL SMOKE LIGHT ILLUMINATED DURING TAXI. SMOKE SMELL WAS PRESENT IN THE COCKPIT AND CABIN. AIRCRAFT RETURNED TO GATE WITH NO INCIDENT. MAINTENANCE FOUND NR 1 ENG P.2.5/P.30 SWITCHING VALVE STUCK IN P3.0 POSITION. SWITCHING VALVE WAS REPLACED. SYSTEM OPERATIONS CHECKED GOOD. AIRCRAFT WAS RETURNED TO SERVICE. (M)