What was found
DURING TRANSIT CHECK, THE APU SHUTDOWN SUDDENLY, THE APU FAIL LIGHT TURNED ON AND FAILURE CODE 49-94299. MAINTENANCE PERSONNEL PERFORMED FIM 49-90 TASK 809 PROCEDURE, REVISION TO CHIP DETECTOR IAW AMM 49-91-81-200-801, DETECTING SILVER COLOR PARTICLES, THIS CONDITION WAS NOT PERMITTED; SO THE APU WAS DEFERRED IAW MEL 49-1 CAT C. AT MEX, THE APU WAS REPLACED IAW AMM 49-11-00, TESTED CORRECT AND THE REPORT WAS CLOSED.