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.