What was found
DCA - FLT 1503 - CREW REPORTED THEY OBSERVED GREEN SMOKE INSIDE THE FUEL FLOW INDICATOR GAUGE FOR THE NR 2 ENGINE FOLLOWED BY A HEAVY ELECTRICAL SMELL. CIRCUIT BREAKER WAS PULLED AND ISOLATED. FLIGHT LANDED WITHOUT FURTHER INCIDENT. MAINTENANCE REMOVED AND REPLACED THE NR 2 ENGINE FUEL FLOW INDICATOR GAUGE AND THE TRANSMITTER. SYSTEM OPS CHECK AND LEAK CHECK GOOD. FUEL FLOW INDICATOR - PN 8DJ33LWX. FUEL FLOW TRANSMITTER - PN 85J50GBZ. REFERENCE: OPERATOR CONTROL NR 96ZZZX6222. (X)