What was found
AT FL 330, RECEIVED AVIONICS SMOKE LIGHT, WOULD NOT GO AWAY, NO SMOKE CONFIRMED. DECLARED EMERGENCY & DIVERTED. FOUND WATER INTRUSION IN LWR FWD CARGO & WATER ON DUCTING & SMOKE DETECTOR 11WA AS SEEN THRU ACCESS DOOR 134AR. REF MM 26-15-12-04, FIG 402, FOR LOCATION. PERFORMED INSP/CHECK OF FWD FSLG DRAIN IAW MM 51-80-21-06. DRAIN CLEAR. SWAPPED KNOWN GOOD DET FROM MCD POS 3A (1WU) INTO POS 11WA IAW MM 26-15-12-04. OPS CHECK GOOD.