What was found
AIRCRAFT WAS GROUNDED: AN EMERGENCY WAS DECLARED INBOUND INTO BOS DUE TO THE FLIGHT CREW REPORTING THAT AT LANDING GEAR EXTENSION NOSE STEERING WHEEL FAULT DISPLAYED AND THE FLIGHT CREW PERFORMED A GO AROUND TO RUN THE CHECK LIST - THE FLIGHT CREW REPORTED THAT THE FAULT CLEARED ON ITS OWN - THE FLIGHT CREW ACCOMPLISHED A SECOND LANDING GEAR EXTENSION AND THE FAULT DID NOT APPEAR HOWEVER DURING TOUCHDOWN AT 90 KNOTS THE FAULT REAPPEARED AND THEY LOST NOSE WHEEL STEERING - THE AIRCRAFT LANDED SAFELY AT BOS WHERE IT WAS TOWED TO THE GATE.