What was found
RDU - FLT 470 - AFTER LEVEL OFF, EN ROUTE MIA-YUL, AT 33,000 FT THE CENTER FUEL TANK OPERATION BECAME UNRELIABLE. CENTER TANK WOULD FEED SOMETIMES AND WINGS WOULD FEED AT OTHER TIMES. WHEN WING TANK PUMPS WERE TURNED ON, THE INLET FUEL PRESSURE LIGHTS ILLUMINATED. AIR INTERRUPTED AND LANDED RDU WITHOUT INCIDENT. REPLACED CENTER AFT FUEL BOOST PUMP. PERFORMED ENGINE RUN AND FUEL TRANSFER CHECK USING CENTER PUMPS AND PRESSURE SOURCE. SYSTEM GROUND CHECKED NORMAL OPERATION. (M)