As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PDX - AIRCRAFT RETURNED TO FIELD DUE TO ELECTRICAL SMELL IN COCKPIT. FOUND 225 AMP CURRENT LIMITER NUT WAS LOOSE AND LIMITER SHOWED SIGNS OF HEAT. CURRENT LIMITER WAS REPLACED AND MOUNTING POINT WAS CHECKED FOR DAMAGE, NONE NOTED. LIMITER OPS CHECKED GOOD, AIRCRAFT RETURNED TO SERVICE.