What was found
1) LOWER CARGO SMOKE/FIRE DETECTION SYSTEM GREEN LIGHT INOP.2) REMOVED AND REPLACED CCU IAW M/M 26-16-00. NO HELP, TRANSFERRED TO DMI #11515 IAW B-727 MEL 26-19 CAT. "C". PLACARDS INSTALLED.3) REF. DMI #11515 LOWER CARGO COMPARTMENT SMOKE DETECTION SYSTEM 1 GREEN LIGHT INOP. 4) REMOVED AND REPLACED BATTERIES IAW M/M 26-16-0. THIS CLEARS DMI #11515 PLACARD INSTALLED.