What was found
ON FLT 300, BWI-CUN, DURING TAXI IN, ECAM MESSAGE FOR SMOKE LAV AND CARGO DETECTOR FAULTED. MAINTENANCE IN CUN RESET CIRCUIT BREAKER AND PERFORMED OPS CHECK IAW AMM 26-17-00-710-01 WITH NO DEFECTS NOTED. AIRCRAFT RETURNED TO SERVICE. UPON RETURN TO BWI, MAINTENANCE INSPECTED LAV"D" SMOKE DETECTOR DUCTING AND FOUND BLOCKAGE REMOVED BLOCKAGE FROM VACUUM RESTRICTOR AND VACUUM WAS RESTORED. OPS CHECKED OK.