The Service Vehicle or Maintenance Required light is there to remind you to do scheduled service on time. When the light comes on look in your owner's manual to see what service is due. Normally this means change the oil/filter. This is not the same as the Check Engine light which means there is a problem with the emission's system.
You say there is no obvious reason, so the first thing you should do is ask them for a reason. If they refuse to give you one, get a lawyer. The problem is that there are a lot of reasons police can impound a car against your will, and it isn't always obvious which of them they are going to use to justify their actions. The police are also pretty unhelpful to common people, but a lawyer can twist their arm a bit by threatening to get a subpoena. If nothing else, the lawyer should be able to tell you whether the police action had a basis, and can help you uphold your rights if they are acting improperly.
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