What was found
INSPECTION TYPE:N/A ON DESCENT PASSING 15,000 FT THE LOWER CARGO FIRE AND MASTER CAUTION LIGHTS ILLUMINATED. ACCOMPLISHED CHECKLIST - LIGHTS EXTINGUISHED BETWEEN 5-10,000 FT. DIVERTED TO IAD. COMPLIED WITH OPERATIONAL CHECKS PER MM 26-18-4. NO DEFECTS NOTED, COULD NOT DUPLICATE. DEFERRED LWR CARGO FIRE DET SYS PER MEL 26-10. REMOVED AND REPLACED CENTRAL CONTROL UNIT PER MM 26-18-04-4 PER UPS SAFETY. OPS CHECKS GOOD. THIS CLEARS M340705.