Next time, learn to observe with your eyes before you whack.
That time when you claimed SMB270Y as a perm 960 do you have an
idea who went out? and also please observe the duty that the bus is
replacing before you confirm.
IIRC SMB270Y is under 960AP15, fleet add for 960 that
time.
But for now, seems like it's rather like WPDEP SP than WPDEP
960