Prep the night before? You havin a laugh, at my depot (stabling point actually) the trains are prepped in the morning and taken straight into service, no chance to fix things.
There are no spare trains and nobody to fix them.
At main depots I would expect things like this to be fixed but if there has been a bit of a run on them (because of a bad batch etc) then there might not be any spares available, you are aseriously saying you would not allow the train to go into service because of a few buttons?
There are no spare trains anymore so it would mean cancellations until the buttons can be sourced/ fitted.
Then why has it not been reported by the driver or conductor up the chain to maintenance so that a mobile fitter / CPTM can go to repair this? It is a very simple job and even with full functional and circuit testing takes less than an hour.
It's not my decision, under the regs that I am given it will fail under the quality plan if certain parts are not functioning properly. So yes, I would turn around and put a stop on a unit for faulty buttons, a train failed in depot is many times better than one failed in service blocking the line. (I'm not just on about passenger operated buttons here)
No spares is not an excuse for parts like this, I can phone up a company now and have anything up to 100 of these buttons on my desk at 6am tomorow morning, they are the current run, and in production, the EAO Series 56 and Series 57 buttons are easy to find!
Even if the parts or modules are not available, then the door should be taken out of use and the button covered to prevent use or injury by/of passengers.
These days, with such modular systems, and ease of getting round the network with spares, there is no excuse!
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There are laws to protect the disabled specifically because in a lot of instances people or businesses might consider a problem like this to be not that important. And if you're able bodied, it's reasonable to think that.
So, if a wheelchair ramp didn't work, why cancel a bus when there's little chance of a wheelchair user needing it - and it's better one person left behind than lots.
If a blind person can't get off the train because s/he can't see which button to press, what about the 400 other passengers with perfectly good vision that sussed it out without trouble?
The problem might be relatively small, even minute, but it's still there and shouldn't be ignored.
While I am sure any TOC or manufacturer could be let off for the occasional fault, fixed as quickly as possible, if these trains are running for weeks or months on end with broken buttons then there's a problem.
In addition to this, there is the potential for the door interlock or safety circuits to pass through this button for proving reasons, so if this is failed in the form of a cover, how does one know it hasn't failed elsewhere and will start causing issues for door interlock circuits, and therefore, train out of service, will not move, TMS will fail to allow it to movem de-training passengers, etc. etc.