What was found
ON LANDING ROLL RECEIVED LEVEL 3 CABIN SMOKE ALERT UPPER DECK. CREW VERBAL REPORTED, IT LOOKED LIKE WAS WORKING THE PORTION OF MDC AFT OF COMPARTMENT TEMP IND ON AIR PAGE. CABIN SMOKE ALERT EXTINGUISHED BY ITSELF AFTER FEW SECONDS. CHECKED INSIDE OF MDC & FELT HIGH HUMIDITY IN THE COMPARTMENT JUST AFTER BLOCK IN. MOISTURE IS DRIED TO REMOVE FROM MDC COMPARTMENT. OPERATIONS TESTED NORMAL MDC SMOKE DETECTION SYS IAW MM26-15-01-5.