Thank you Gary,

I had a similar problem with my PSR740. For the most part, I have had good luck with my Yammies.

Luckily, I know a young man, just out of high school, with a lot of technical expertise. He has been fixing my keyboards the last several years. He has fixed these types of things for me before. Hopefully, the problem is what Gary described.

Thank you,

Beakybird