What was found
JFK - FLT 1270 - EN ROUTE SJU-EWR, LEFT ENGINE WAS SHUTDOWN FOR APPROXIMATELY 10 MINUTES DUE TO LEFT WING OUTER TANK INDICATION SHOWING FUEL QUANTITY GOING UP AND DOWN. LANDED JFK WITHOUT INCIDENT. AFTER AIRCRAFT LANDED INSPECTED LEFT WING WITH NO FUEL LEAKS BEING NOTED. CLEARED AND CLEANED COMPENSATOR HARNESS CONNECTOR OF ALL CONTAMINATES AND PERFORMED CAPACITANCE AND RESISTANCE CHECK OF LEFT WING OUTER TANK. ALL CHECKS WITHIN LIMITS. SUMPED LEFT WING OUTER TANK AS REQUIRED. ACCOMPLISHED INSPECTION OF LEFT WING TANKS. NO LEAKS NOTED. SYSTEM GROUND CHECKED NORMAL OPERATION. (M)