What was found
EICAS MSG RECIRC SMOKE DETECT FAIL ( RECIRCULATION SYSTEM SMOKE DETECTOR – PACKS OPERATIVE ). REMOVED FROM SERVICE. C/W FIM TASK 21-26-00-810-813-A, REMOVED AND REPLACED SPDA 2 DISCRETE/IO MODULE, SLOT M11 IAW E175 AMM TASK 24-61-05-000/400-801-A. OPS TEST GOOD IAW E175 AMM TASK 24-42-02-860-801-A. SMOKE DETECT FAIL EICAS MSG WENT AWAY. C/W AMM TASK 28-41-00-210-801-A, GVI OF THE HARNESSES OF THE FUEL QTY INDICATION SYSTEM, NO DEFECTS NOTED, THIS ACTION CLEARS MEL 26-16-00(A), DEFECT # 966615. PLACARDS REMOVED. AIRCRAFT RETURNED TO SERVICE.