What was found
10 SECONDS AFTER SELECTING AU HYD PUMPS ON DURING BEFORE START APU COMPLETELY SHUT DOWN ALARM SOUNDED.(<P>TRANSFERRED TO MDDR 151805 PER MEL 49-11-01-01. APU PNEUMATICS INOP, CAT C, DUE DATE 23AUG21. DDG 36-11-04 COMPLIED WITH.</P> / <P>LP 1370461 - 14AUG21 - ITEM 4 - ONT - C/W WITH ECM 2021P-274 AND REMOVED AND REPLACED ECU IAW AMM 49-61-05. OPS CHECK GOOD. THIS CLEARS DMI 151805. PLACARDS REMOVED. MCC NOTIFIED. </P> / <P>LP 1370462 - 14AUG21 - ITEM 9 - ONT - C/W ECM 2021P-274, REMOVED AND REPLACED APU CONTROLLER, REF MDDR 151805 FOR R/R. OPS CHECK GOOD.</P>)