What was found
FOUR HOURS INTO FLT AT FL340, A LOUD BANG WAS HEARD WITH A DEFINATE SHUDDER. CONFIGURATION PAGE SHOWED NO LT NOSE GEAR PRESSURE. NORMAL LANDING AND TAXI. CHECKED ACFT FOR DAMAGE OR MISSING PARTS. NO FAULTS FOUND. "TP CHANNEL NL" SHOWN IN CURRENT FAULTS. R & R BTM/TPI COMPUTER, NO HELP. R & R PRESSURE TRANSDUCER, NO HELP. REPLACED INBD REFUELING ADAPTER FLANGE.