An abend occurred while the asynchronous MSCH (modify subchannel) completion module (ERBMFIDX) was processing. ERBMFIDX is scheduled as an SRB routine upon completion of an asynchronous MSCH request. The internal FRR recovery routine ERBMFIDF requests an SVC dump. The areas dumped are SQA, LSQA, TRT, PSA, and SUMDUMP.