What was found
(CAN) WHILE ON DESCENT, THE R MAIN EJECTOR CAUTION MESSAGE BECAME APPARENT TO THE CREW. AT THE POINT OF SHUTDOWN, THERE WAS 80 LBS OF FUEL IN THE CENTRE TANK.MAINTENANCE FOUND THE RT MAIN EJECTOR PRESSURE SWITCH SENSE LINE (CC670-62258-1) TO BE BROKEN JUST AT THE FERRULE GOING INTO THE "B" NUT. AFTER OBTAINING THE APPROPRIATE AUTHORIZATION, THE AIRCRAFT WAS FERRIED FOR INSTALLATIION OF A REPLACEMENT PART.