What was found
THROUGH ALL PHASES OF FLIGHT WITH GEAR UP WE HEARD A LOUD BANG AROUND THE NOSE AREA ACCOMPANIED WITH A PROX SYS FAULT STATUS AND GEAR POSITION INDICATIONS APPEARED ON EICAS. THESE EVENTS OCCURED AROUND 4 TIMES THROUGHOUT FLIGHT. UPON GEAR EXTENTION ALL INDICATIONS WERE NORMAL / INSTALLED SELECTOR VALVE IAW CRJ 900 AMM 32ˆ’32ˆ’10ˆ’400ˆ’801. OPS CHECK FAIL. SLAVED IN LANDING GEAR CONTROL LEVER IAW CRJ 900 AMM 32ˆ’31ˆ’01ˆ’000/400ˆ’801. OPS CHECK FAIL. REMOVED AND REPLACED PSEU IAW CRJ 900 AMM 32ˆ’61ˆ’01ˆ’000/400ˆ’801. OPS CHECK GOOD.