As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SMOKE FROM CAPTAINS TRIM SWITCH RIGHT AFTER START. TRIM WAS NEVER ACTIVATED BUT IT WAS AUDIBLY 'RUNNING AWAY'. REPLACED CAPTAIN CONTROL TAILPLANE TRIM SWITCH AND ASSOCIATED WIRING. SYSTEM OPERATIONAL CHECKS GOOD IAW MM 27-40. AIRCRAFT RETURNED TO SERVICE. (M)