What was found
JUST PRIOR TO LEVEL OFF AT FL410, THE AMBER FUEL PRESS LOW L CAS WAS CYCLING ON/OFF (AT LEAST 5 TIMES). QRH PROCEDURE WAS ACCOMPLISHED, WITH BOOST PUMP L ON. THE AMBER CAS EXTINGUISHED. ABOUT 15 MINS LATER, BOTH PILOT NOTICED A VIBRATION IN THE SEAT AND YOKE. THE BOOST PUMP WAS ON FOR THE REMAINING FLIGHT UNTIL SHUTDOWN. CROSSFEED WAS OFF AT INITIAL CAS. REPEAT WRITE UP. CORRECTIVE ACTION: REMOVED SUSPECTED FAULTY PCB BOARD P/N: 6918602-11 S/N: 33315742-1 FROM POSITION LH NZ107, AND INSTALLED A INSPECTED PCB BOARD P/N: 6918602-11 S/N: 31257355-2 IN POSITION RH NZ207. PERFORMED OPS CHECKS WITH NO DEFECTS NOTED. WORK DONE IAW CE-680A AMM 24-60-35.