KF were resisting the introduction of dye, as they are only supposed to be recharging fully functioning system. If it's empty when it gets there, they should refuse the work straight away. Some don't though. They didn't want to get into the whole diagnostic and repair business.
Unfortunately, most systems work very well until the break (or leak) completely. It's very very rare that they have a residual loss over a long period of time, such that the system is empty. I know everyone talks about the 'normal' 10% (or whatever) loss each year, but in practice is never happens. If you have no (or very little) gas left, then it's 99.9% certain there's a leak, and any replacement gas willsimply go the same way, and usually fairly quickly. No fancy machines with print outs change this.
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