8629K or 8677X could be out from Service 34
after the addition of 6173X.
Sv 34 has an extra bus in the fleet (don't think there's a fleet
add in the 1st place), and I've seen all the Euro IV KUBs appear at
least once in the past week or so, except for these 2 Euro
Vs.
8629K was on 119 yesterday (18 May, Fri). Didn't get the chance
to check the perm stix though.
IIRC Svc 34 buses include:
8146,8147, 8151, 8252, 8325, 8437, 8616, 8629, 8677, 6143, 6147,
6173
Total 11 buses as stated in Wiki