What was found
DURING INITIAL CLIMB OUT ENG FIRE DETECT FAIL R CAS MSG POSTED. THE MSG CLEARED & RE-POSTED SEVERAL TIMES DURING FLIGHT. THIS WAS NOT ASSOCIATED WITH ANY THROTTLE MOVEMENTS. PERFORMED ENG FIRE DETECT FUNCTIONAL CHECK WITH NO DEFECTS FOUND. ACCESSED COMS & VERIFIED FAILURE ON FLIGHT LEG 2. GAINED ACCESS TO AFT J BOX & REMOVED NZ208. INSTALLED PCB BLACK OUT BOX & VERIFIED WIRING TO BOTH SENSORS WHICH ALL CHECKED GOOD. GAINED ACCESS TO MAU NR 4 & VERIFIED WIRING FROM PT906 TO JZ208 WHICH ALSO CHECKS GOOD. CLEANED MAU CONNECTORS & PCB CONNECTORS. REMOVED NZ108 PCB REPOSITIONED NZ108 & NZ208. RECONNECTED PT906 ON MAU NR 4. CLOSED AFT J BOX COVER & AFT BAGGAGE ACCESS PANEL. PERFORMED FIRE DETECT FUNCTIONAL CHECK. OPERATIONS CHECKED GOOD IAW 26-10-01. ALL WORK DONE IAW MM CH 24-60-10. REMOVED PARTS, RT AFT PCB ASSEMBLY FIRE & SMOKE PN 6918622-41, SN 0310 & LT AFT PCB ASSEMBLY FIRE & SMOKE PN 6918622-41 SN 0311.