What was found
APU INOP ( AUXILIARY POWER UNIT (APU), ER OPERATIONS NOT ALLOWED (NOTIFY DISPATCH) R60(<P>TRANSFERRED TO DMI 156541 MEL 49-11-01A CAT C </P> / <P>12NOV21 - LP 1476572 - ITEM #4 - ONT - PERFORMED APU BITE IAW FIM 49-11 FAULT TREE 987. LIGHT TEST FAULTED WITH LAMPS AND FAULTED GEN FILTER. REMOVED AND REPLACED APU ECU IAW AMM 49-61-05. OPS CHECK GOOD, NO FAULTS NOTED. THIS CLEARS MDDR 156541, PLACARDS REMOVED. </P>)