I have a Fireface UFX from 2012 that is having an issue (again) that it had soon after I bought it.  At the moment, two of the line input channels are self generating noise and accepting no input.  The meters show full clipping at all times.  The noise itself is a crackling sound.

The last time this happened (2012) on almost all the line input channels, and I was told by support that the board needed to be resoldered, which was taken care of under warranty I believe.  I would like to have my unit repaired again, as I rely on this interface and need it to work.

Where do I start a repair ticket?