What was found
FAULT LIGHT ILLUMINATED ON FIRST APU 'COLD SOAKED START' ATTEMPT AT FL 360. APU STARTED NORMALLY ON SECOND ATTEMPT AT FL300. GROUNDED - YES. REF LOGPAGE 11864703 PERFORMED APU BITE CHECK IAW FIM 49-60 TASK 801, FOUND FAULT CODE 49-52017 REVERSE FLOW SHUTDOWN, PERFORMED FIM 49-50-801, PARAGRAPH A THRU F (3), FOUND NO DEBRIS IN INLET OR INLET PLENUM, OPERATIONAL TEST OF THE INLET GUIDE IGV ACTUATOR LINKAGE FOUND NO DEFECTS, MEL 49-99A APPLIED.