John
I had same problem . . . . the lettering on 2-3 buttons were fading. I contacted Yamaha in the US and they did approve to replace them under warranty. The warranty in US is only 1 year !!!
I thought this was not a major problem, basically cosmetic, the functionality of keyboard was not affected. But I thought this could decrease the value of the Genos if I ever sold it, so, it looked like a no brainer . . . one year warranty and an easy fix . . . I should change those buttons.
So, Yamaha gave me a list of approved tech people in my area . . . . There were only two techs nearby.
Contacted one, went thru the warranty process and the tech ordered new Yamaha parts and replaced the buttons. Tested everything and it was good.
So far so good, only problem is that after a little while, other buttons were fading, so, i went thru same process again, the tech replaced the additional buttons . . . . tested everything worked fine. . . . however, after a few days some buttons were not functioning correctly . . . . . it looked to me like the tech did not connect something inside properly . . . .
Called Yamaha again, went thru process . . . contacted another tech from Yamaha list . . . . second tech fixed the problem, tested and everything great . . . . . after a while more problems with buttons not working properly and other buttons fading . . . . went back thru same process . . . . second tech fixed the problem . . . . . tested and everything good . . . . then after a while more problems and tech had to replace not only buttons but a board inside . . . . . . etc . . . . . in the end it took me more than a year and several times going back and forth . . . . for a purely cosmetic problem.
In the end, i was wondering if it was worth it. If I knew i would go thru all that for a couple of fading buttons i would not have done it . . . . .
I have to say that Yamaha was great in supporting me ...... they were always very understanding even if the one year warranty expired in the several-months process . . . they always approved the work at zero cost to me even with expired warranty.
Things are great now . . . Genos is working great, no problems and faded buttons replaced.
Bottom line, if you do this, plan ahead . . . . .in my case it took more than a few days . . . . it was actually several months . . . . . . . hope you have better luck and better techs in your area.
Have a great day.