What was found
ON TAKEOFF, EICAS SHOWED LG AIR GROUND FAIL. COUPLED WITH LOUD BANG ON NLG EXTENSION: MAINTENANCE: TESTED ALL WOW PROX SWITCHES, IAW AMM 32 63 05. ALL TESTED GOOD. FOUND NOSE UP LOCK ROLLER SEIZED DUE TO PRC. REMOVED PART OF THE PRC AS REQ. NO OTHER DEFECTS NOTED. OK FOR SERVICE. SEE SEQ 3 FOR GEAR OPERATIONS CHECK.