Oh oh my bad. Sorry for that. 
I think you just need to pay more attention to
which SP KUB has been appearing on Sv 410 lately. If you can find
that KUB, I think puzzle solved. Unless Sv 410 is waiting for that
6314G to come out, then it might explain why they used random KUBs
as you posted before?
Actually this does not happn for the first time. I did remember
in March when SBS8503P has been missing from Svc 54 for 2 to 3
months and random KUBs (mostly Euro V) are replacing its shift. The
first week when this bus is is missing it's always SBS5100M which
is replacing its time slot, and I almost thought it's perm 54.
After which, random AMDEP SP buses such as SBS8832P and sometimes
other perm 54 KUBs constantly replaces its shift everyday till the
day when SBS8503P returned.
I guess this may apply to SBS8538P, whereby for this case
SBS8483M replaces SBS8538P's shift and random KUBs keep on
replacing SBS8483M's shift. The replacement KUB is usually a Euro V
bus rather than a Euro IV bus and this may last for quite some time
but not too long, hopefully SBS8538P will be back in 2 or 3 months
time, if that is what I predicted happened.
