What was found
APU FIRE WARNING APU FIRE FAULT CAUTION APU DOOR INHIB. APU AUTO SHUT DOWN AT 4000FT SPEED 210. INSPECTED AFT EQUIPMENT BAY & APU, NO EVIDENCE OF FIRE. PLACED APU FIRE DETECTION ON MEL 26-12-11 CAT C. PLACARD INSTALLED COLLARED CB A1, CBP 5, CBP 1, N-12, CBP 1 S3. ACFT OK FOR SERVICE, COMPLETED DDG 49-10-11. R & R FIREX CONTROL UNIT IAW AMM 26-10-01, OPERATIONS CHECKED GOOD REACTIVATE APU.