What was found
FLT 1862 - BWI - DURING APPROACH TO DCA, GEAR WAS LOWERED BUT WE HAD NO INDICATION OF SAFE INDICATIONS. DIVERTED TO BWI. EMERGENCY DECLARED. MAINTENANCE CYCLED THE GEAR SEVERAL TIMES, COULD NOT DUPLICATE FAULT. REPLACED THE FOLLOWING ITEMS AS A PRECAUTIONARY MEASURE, L/G AIR GROUND RELAY, LIGHTS C/B, MASTER DIM BUS C/B. GEAR SWING NORMAL. (M)