i just replaced the fuse and it blows immediately ---what might cause this?

I was recently given a Fender Champion 30 in non-working condition.  When using my multimeter to diagnose the problem I found that creating a connection between the P11 Pin and the fuse would make the amp work.  How would I go about (re)establishing a permanent connection between the two?  I have included a picture to better illustrate my question.

I touched the multimeter probe from the pin closest to the fuse to the fuse itself and the power light on the amp illuminated.