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no front panel display means one of twot hings: either the power transformer is blown, or the main power fuse. If the main power fuse is blown, then there are likely to be shorted output transistors that will need to be replaced.
Doubt the main pcb needs replacing, but the standby transformer would definitely go in that situation. Standby transformer wouldn't be that expensive, but no way to say that it's the only thing that is bad. It is also soldered in, so you would need to know how to do that to replace it, or bring it to someone who could. If you're staying long-term in Europe, it might just be better to buy something local so as to not run into this problem again.
Generally speaking, an amp attempts to protect itself from heat, shorts, overloads and operator exuberance by refusing to turn on or stay on.
Overloads can be from excessive periods of high output or marginally low impedance loading by the speakers; and shorts would be wiring issues or a speaker blowing up.
You should be able to feel if it's hot. WHY is it overheating? Make sure it has sufficient ventilation on all sides and that vent holes are not blocked by dust balls. Ensure the fan (if equipped) is running as designed (some only operate on demand). Clean dust and debris from it.
If the amp comes back on after cooling, you're lucky. They only have so many self-protection cycles in their lives so continuously resetting or cycling their power without addressing the cause can do more harm than good.
If it protects immediately on a cool power up you should disconnect the speaker connections and try it 'nekkid'. If it comes up then diagnose which lead(s) are shorted. If it does not come up the problem is internal and should be left to an experienced and competent hands-on tech.
Does it still do this if the speaker wires are disconnected? The amp is protecting itself from a short on the output. maybe yo have a dead or distorted driver in one of the speakers. Also there could be a defect in on of the amp circuits.
just a question.1st.. if you don't know what you should have... then what are you going to do... if it's lower or higher ... seems like you should have a print before you go looking...go check at the off and on switch for the standby .. 9v more or less to trip the relay to turn the sys. on... now get a print...or go backwards to the transformer to see if it's blown. or something in between is open