Opening df74da02.msg-hdr.bad
df74da02.msg-hdr.bad Packet Type 2e (prod: 10FF, rev: 1.9) from 3:633/280 to 3:633/509
df74da02.msg-hdr.bad 00003A Corrupted Message Header (DateTime)
When I look at a few, it looks like SBBSecho (and pktdump) thinks they are bad because of DateTime, but they look ok to me: