MK IV pull shift on rhy2 prescence not working

[Sp3ktral]

MK IV
pull shift on rhy2 prescence is not working
I just bought the amp and I knew the problem was there when I bought he amp
any suggestions for a possible quick fix before I cart it off to a tech

not that I'm an expert but my first thought is to try replacing the push/pull pot

 

[Restless Rocks]

MK IV
pull shift on rhy2 prescence is not working
I just bought the amp and I knew the problem was there when I bought he amp
any suggestions for a possible quick fix before I cart it off to a tech

not that I'm an expert but my first thought is to try replacing the push/pull pot

Ditto on replacing the push/pull pot. But have the tech do it. He could also tell right away if the switch is opening and closing as it should anyway.