Help with JC-20JT power please

[BolanAudio]

Hi everyone! I just wanted to double check my logic before I accidentally blow up my amp.

My dad gifted me a Japanese Roland JC-20JT for Christmas. Because I live in the US, I thought I was going to have to swap the transformer but once I opened it up I found that both the transformer and the board were marked 100v/117v. So I shouldn't need to do a transformer swap, right? Or am I missing something? I will still be swapping out the 2 prong japanese power cable for a 3 prong.

[g1]

Usually there are still some adjustments need to be made, like moving some jumpers on the board, or using different wires on the transformer.
It's possible they designed it to work for both voltages as is, but our modern line voltage is a lot closer to 125V rather than 117V.  So there is a danger of some components being subjected to voltages that are too high for them (the first thing I would be worried about would be the main filter capacitors).
I tried to find a schematic or service manual but there doesn't seem to be any readily available online.  That would show if there is anything that needs to be changed internally to run on North American line voltage.