I see, thanks for the update. 
So 2612Y is MIA recently?
6238T is confirmed replacing 984L's timings one-for-one uh,
stuck on 109 for 3rd week already and still replacing 984L's
timings. Except for today, which 8622D did 984L's timings instead.
But funny thing is, I still can't find any perm stix on the
dashboard nor coinbox for 6238T. Same for 6235B (HG SP). Haven't
checked the A pillar of BC cabin though.
As for 6252B, it is definitely perm BN 109 cause I have been
taking that bus every day for the past 2 1/2 weeks on 6116L's
former timings during AM Peak, and 6116L doing one slot ahead now
instead as I had posted before. As for why you see different buses,
maybe 6252B pulled to do some other service for PM Peak instead
idk, but just to say everyday for past 3 weeks at least, 6252B is
on 109 everyday.
I suspect BNDEP taking over one HGDEP slot. I have observed
6116L doing 2612Y's PM timings for a whole week oredi.
