Anyway guys, some update for all:
SBS3931U SBS3946C
(BN SP)
(BN 2)
SBS9412L SBS9828X
(BN 2)
(BN SP)
No obvious reasons why they swapped out 2 non-WABs for 2
WABs..
Although one point to note, is that IIRC, 9412L has been perm on Sv
2 since it's first day out on the roads (that's like 1996 till
now..) So mileage should be one of the factors for the swap.
9447L also the same, 19 yrs on 2