Spares are expensive, more so if they need to be imported
(especially the L94UB). Plus the waiting time for the spares.
Also, if the bus is of a different type for the norm that SBST
uses, it requires additional training to repair the bus and there
is also limited expertise to handle the bus. tat's why SBST has
stuck to the B10M since the 1980's and bought more than 1,000 of
them.
