Vintage Yamaha PortaSound PSS-130 Keyboard

Description

Pictures show condition.
Fully functional -all keys work perfectly with the exception of one of the white ones towards the right end. It functions randomly, but more often than not. Most likely, the sensor simply needs cleaned by taking the board apart and wipping it clean.
I Clean and solid, although you will find blemishes here and there.
There looks to have been paint splattered on the back end. I attempted to clean it off and created a blemish. Whatever it is, it's some good stuff.
Clean battery compartment.
Tested with batteries only. No AC adapter included.
Any questions?