Acc. to updates on sgwiki:
SBS8817J SBS8818G
(BRBP SP
BRBP 90)
SBS8808K
SBS8809H
(BRBP 90
BRBP SP)
New buses for 90 again...
I think it would be AMDEP. Firstly, AMDEP and BNDEP are from
East Dist while HGDEP is from West Dist, so it would be easier to
transfer buses. Secondly, one of AMDEP's TRG bus (SBS1986A) had
went to be a 58 perm, so AMDEP now has 1 less TRG bus. Just sharing
my thoughts, it's still better to let someone confirm it though

The Strider that was perm 58 and went to TRG and which is nw back
to 58 agn is SBS1988U nt SBS1986A.
And yeah the timing in which 1988U went to rev svc from TRG and
2819T went to TRG from rev svc tells that 2819T is the bus
replacing 1988U for AMDEP TRG.Haha i wldnt be surprised if 2819T
gets kicked out back to rev svc agn next week and another MK4 is
pulled into TRG.Cuz this practice has been going on for quite a
while alr recently.