What was found
FLIGHT 2195. RECIRCULATION SMOKE DETECTOR FAILED EICAS MESSAGE. RAN QRH FOR MESSAGE. REMOVED FROM SERVICE. FAULT WAS ACTIVE ON STARTUP F/C 26107300AM2. ON SUBSEQUENT RESTARTS FAULT WAS NOT ACTIVE. C/W FIM 26-16-00-810-801-A ELECTRICAL CHECKS, NDN. CONTINUED ELECTRICAL CHKS REF W/M 26-10-50, DISCONNECTED & RECONNECTED SMOKE DETECTOR IAW AMM 26-16-01-000/400-801-A FOR ELECTRICAL CHECKS, CONNECTOR P3372 PIN B READ 17 OHMS TO GROUND, THEN READ 'OL' AFTER CYCLING BREAKER. CHECKED CB0240 RECIRCULATION FAN IAW SWPM 20-35-01. FOR REF: DC BUS 2 BAR TO GROUND READ 3 OHMS. FOUND LOOSE SCREW ON BUS BAR SIDE OF CB0240. SECURED THE SCREW & CLOSED CBP IAW SWMP 20-35-01. NOW P3372 PIN B READS 5 OHMS. RECIRC BAY SMOKE DETECTOR OPS CHECK AMM 26-16-01-710-801-A, CHECKS GOOD, DEFECT CLEAR, MTX CTRL NOTIFIED. RETURNED TO SERVICE. NO PARTS REPLACED.