Anyone got any recommendations, or willing to do 'at heights' repair?

I believe my LNB is shot, one of the feeds drops out after a few hours of use, and the only way to bring it back online, is to power it on and off. To make matters worse, I can't get it to work as a single feed as it needs both plugged in to power up???? is that right?

Any way if it does need replacing, I'd like it to be swapped with a quad, tidy up the two cables running down the back of the house, and add two further runs which need to feed into the loft above the bedroom. Also I may or may not after discussion fancy a zone2 dish attached to the wall in my garden if they think it can pick up 13e (as a roof may block it, the android app shows it almost touching the lip of the roof).

Now the hard bit!! My dish is attached to the chimney, which is at the peak of the roof ridge, and its a slate roof.