What was found
AT CRUISE FL370 THE MAIN AND UPPER DECK EXPERIENCED STRONG ELECTRICAL PLASTIC SMELL UNDETERMINED ORIGIN BUT BARELY NOTICEABLE IN COCKPIT. THE SMELL MOVED RAPIDLY THROUGHOUT CABIN. TURNED OFF L-R UTILITY. SMELL DISSIPATED ON GROUND. F/A REPORTED AN ARCING NOISE ABOVE 2R SMELL CAME BACK DURING FINAL APPROACH BUT DISSIPATED. DURING TAXI, SMELL SEEMED MORE LOCALIZED TO THE 2R AREA. *S/D* GASPER AIR MOTOR FAILED. REPLACED MOTOR, NO FURTHER PROBLEMS.