I must say that TIB634D has been running around nowadays. Not
faithful to it's perm service. Last Friday, saw it at Yishun,
today on 985 and a few weeks ago, it brokedown.
I suspect this:
TIB634D
AMDEP 190 
AMDEP SP
Hmm, it may be possible. But then again, split shift perm buses
always tend to cameo on every single service they can. Not
necessarily they can become spares. So, im guessing TIB634D is
still a 190. Just observe which AMDEP rigid does 190 for the next
few weeks.. Though that may not prove TIB634D is a spare, but it
does somewhat help. But im thinking that TIB634D, being the last
AMDEP rigid O405 OAC bus NOT TO BE refurbished, may be undergoing
refurbishment now.
