What was found
AT FL 350, ATTEMPTED OPENING OF FUEL CROSSFEED VALVE FOR FUEL BALANCING, BLUE LIGHT DID NOT ILLUMINATE EITHER BRIGHT OR DIM. PERFORMED QRH PROCEDURE, NOTICED FUEL CROSSFEED CIRCUIT BREAKER OUT P6-3, B-7 LOCATION. SUSPECT CROSSFEED VALVE REMAINED CLOSED. RESET CIRCUIT BREAKER P-6-3 PANEL, B-7 LOCATION FUEL CROSSFEED IAW AMM 20-60-01. PERFORMED OPS TEST OF CROSSFEED VALVE IAW AMM 28-22-21-710-801, GROUND VERIFICATION NORMAL.