I haven't verified this for sure yet. But I believe the main CPU and the other node board are standard Spike 2 boards. Which would mean that the documentation is already out there. And that they will be as readily available as they are for any Spike 2 system. The other main parts (flippers, light boards, slings) are all standard too I believe. There is also built in diagnostics for Spike 2. A manual is rarely needed. Mostly just for part numbers.
So, if these are indeed the same parts used in the other Spike 2 games. Then there will be no more problem servicing these as any other Spike 2. I don't know anyone who has difficulty keeping their modern Stern games running and in good repair.
For me, serviceability does not come into the equation when considering purchasing this or not.
Just my 2 cents.