What was found
MAIN HYDRAULIC SYSTEM PRESSURIZES AT RANDOM INTERVALS DURING FLIGHT. CREW REPORT UPON ARRIVAL AT DESTINATION: THE MAIN HYDRAULIC SYSTEMS PRESSURIZES AT RANDOM INTERVALS DURING THE FLIGHT AND FLASHES A WHITE LIGHT ON THE ANNUNCIATOR. ON 1 OCCASION, IT REMAINED PRESSURIZED CONTINUOUSLY FOR A FEW MINUTES AND WAS CURED BY RECYCLING THE FLAPS A COUPLE OF TIMES SINCE THEY WERE THE LAST TO HAVE BEEN USED. TROUBLESHOOTING REVEALED THE RT SPEED BRAKE DOOR NOT FLUSH WITH THE WING SKIN WHEN CLOSED AND REQUIRED RE-RIGGING. FLAP SYSTEM FUNCTION CHECKED AND IT WAS NOTED THE FLAP FOLLOW UP INDICATOR HAD DELAYED ACTION WHEN FLAPS SELECTED FROM 0 DEGREES TO 15 DEGREES. THIS FAULT HAS BEEN TRACED TO INCORRECT ROUTING OF THE FLAP FOLLOW UP CABLE IN THE PEDESTAL SECTOR.