As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
APU PNEUMATIC INOP(<P>TRANSFER TO MDDR 128583 IAW DDG 49-11-01-01, CAT 'C', DUE DATE 30 MAY 20.</P><P>LP <SPAN>1166935: </SPAN><SPAN>REMOVED AND REPLACED APU ECU PER FIM 49-11 FAULT TREE 958 IAW AMM 49-61-05. APU PNEUMATICS OPS CHECKS NORMAL. THIS CLEARS MDDR 128583. ACL @ 04:53</SPAN></P>)