Unlike Kriske, Krehbiel has (in my opinion) very little chance to be on the 40-man roster through the winter.
That said, I do think he is an upgrade over Barreda and could competently throw 3-5 innings over the final week and a half of the season.
Yeah, I have no idea what the cost would be to fix the sound system.
I do know that flat screen tvs are incredibly cheap and they could easily upgrade all of the tvs next to the concession stands and under the overhangs in the back of the lower level and club level for well under $50K. Half of the tvs don't work and the ones that do all look terrible because they are the world's oldest flat screens. Super easy fix.