Try isolating the Sv 43 and Sv 43M buses first. I know they're
interchange-able as of now, but I think they're being handover as 2
separate svcs.
The ones that are on 43M during Peak, they're the ones likely perm
43M as their parent svc. If you think along the FFw buses system
(eg 151e during Peak, 151 during Off-peak)
43M buses:
SBS3435K, SBS3458U
SBS6498J, SBS6499G, SBS6500K
1 random DD from 43 (usually SBS3440U, SBS3445G or SBS3459S, may
be other DDs sometimes)
The random DD slot was previously SBS3765H slot, but SBS3765H is
now perm 102 on SBS3434M slot (confirmed), but SBS3434M is not on
SBS3765H slot.
Besides, the 3 random DDs stated above are all S shift buses on
43 on their usual slots, so I don't really have a chance to see
what bus is doing the original slot.
Anyway, the random bus slot is an A/P slot, and its first perm
was SBS3431X.