What was found
(CAN) FOLLOWING RECEPTION OF ADVISORY WIRE NR AW604-28-0082, BORESCOPE INSP HAS BEEN PERFORMED IN THE 1 AND 3 INCHES FUEL BALANCE TUBES OF BOTH WINGS. THE RESULT IS, ALL TUBES SEALED WITH PRC ARE PARTIALLY BLOCKED (ESTIMATED AVERAGE BLOCKAGE 10 TO 20 PERCENT, 1 AT 50 PERCENT). ALL BALANCE TUBES ARE TO BE REPLACED OR MODIFIED. IT CAUSED OVER THE YEARS, A LOT OF FUEL SPILLAGE, RAMP CLEANING, DELAYS NOT TO FORGET THE RISK OF ACCIDENT.