Not sure where to post this, but I would like to say that
SBS9580J (AMDEP 133) is
refurbished. 
Features:
- Repainted livery and rims
- Repainted yellow (darker than original, khaki) door handles
and poles from the front to exit door area (lower deck). The pole
along the staricase is also repainted, looking very clean!
- Cleaned flooring, looks quite shiny!
- Repainted doors (the black frames)
*Unfortunately, the original aircon ducts were not cleaned and
are still dirty! 
Also, a new black
CCTV was spotted on the upper deck just in front of the
'BUS
STOPPING' sign. However, I am glad that AMDEP has
kept many of the original pink seat covers on SBS9520H and this
bus.
Seeing the thorough refurbishment for this bus, I would say that
this bus has been extended for 2 years.
Definitely it is here, any information that proves crucial as to
whether a bus will get extended (e.g. is the bus refurbished; is
the bus spotted laid up, etc.) will go here.