not sure also as now HG seem dun paste perm stix on this new
buses anymore and now playing with this new buses by making
them staying on 1 svc for a few wks or month then make them switch
to another svc again . 
buses like :
6768E stuck on 101 now
6767H stuck on 109 around a month liao
6747R 6756P 6759G 6760B stuck on 159
SBS6128C seems to be missing from 101. KIV.
SBS6747R was actually a confirmed 101 perm before.
Also, SBS5232R is perm 113, but unsure if it is fleet add or perm
replacing a bus. Definitely not replacing SBS6726B and SBS921T.
(Please check the ett, and not hear from just "observations".
Thanks.)