Poor maintenance.
In the first few years you can send them back to the dealer as
they are under warranty. Once that period has passed, you are more
or less on your own.
You can buy the best buses on the market with all the bells and
whistles, and still turn them into rubbish if you do not have the
proper maintenance regime.
Well, SMB220S has violent closing front doors, but the flaps
haven't spoilt... Also, the doors on the MANs would close more
violently if the flpas are spoilt. Are violently fast motors an
effect of factory error?
