When you say the starter is having trouble, is it having trouble spinning or is it spinning and just not starting? Those are very different things. If it's having trouble spinning, it could be a failing starter or battery.
If it's spinning but the ending just isn't starting right up, there are a few things to look at. Diesels are pretty simple engines, so there aren't a ton of areas to look at.
I'd start by looking at the glow plug system. I've been doing that a lot actually as mine has been acting up! But if they don't glow, you may have trouble starting, and those troubles get worse as the temperature drops! Your "WAIT" light on the dash is supposed to meet up with how long the plugs should be given to get to a starting temp based on the actual temperature, but the light being on doesn't mean the plugs are being powered.
The second thing I would be investigating is the possibility of a fuel pressure leak. If your bus has an electric fuel pump, you may be able to overcome a little pressure loss just by waiting a few more seconds before hitting the starter. If it's mechanical, filling an empty line is a pretty tough job!
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