What was found
ON SHORT FINAL GOT "TO LOW FLAPS" WARNING TWICE ALL INDICATIONS WERE NORMAL. PERFORMED A GO AROUND, ON SECOND APPROACH GOT ANOTHER TO LOW FLAPS WARNING AS WE TOUCHED DOWN. ( EGPWS - WARNING SYSTEM ) REMOVED FROM SERVICE. INTERROGATED CDS AND DID NOT FIND ANY FAULTS, PERFORMED OP TEST OF EGPWS SYS PER Q400 AMM 34-42-00-710-802, OP TEST GOOD, SYSTEM SHOWS NO FAULTS, REMOVED AND REPLACED EGPWS COMPUTER PER AMM 34-42-01-000-801, 34-42-01-400-801 OP TEST GOOD, PLACARDS REMOVED, NO CB'S OUT, CLEAR MEL. AIRCRAFT RETURNED TO SERVICE.