What was found
APU PNEUMATICS INOP ( AUXILIARY POWER UNIT, PNEUMATIC FUNCTION )(<P>TRANSCRIBED TO MEL LIST MDDR 152437 DMI # 49-11-01-01 DUE 03SEP21, CAT C. MAINT ACTIONS C/W PER 152437. PLACARDS APPLIED.</P> / <P>25AUG21 - 1397821 - ITEM# 5 - CVG - REMOVED FLOW SENSING MODULE & INSTALLED SERVICEABLE MODULE PER AMM 49-53-08 PT SENSOR FAULT GONE. PNEUMATIC OPS CK FAILED SEE ITEM M7 FOR NEXT MX ACTIVITY. S/N OFF - 9110. P/N OFF - 3885081-1.</P> / <P>25AUG21 - 1397822 - ITEM# 7 - CVG - REMOVED APU AIR BLEED VALVE & INSTALLED SERVICEABLE VALVE PER 36-11-10. VALVE FAILED TO ACTUATE SEE ITEM 8 FOR NEXT MX ACTION. S/N OFF - 24509. P/N OFF - 2780540-101.</P> / <P>25AUG21 - 1397822 - ITEM# 8 - CVG - REMOVED APU SURGE VALVE CONTROL & INSTALLED SERVICEABLE VALVE PER 49-53-01. OPS GOOD. DMI 152437 CLEARED. </P>)