Access through kitchen cabinet to pipes
I am not sure which forum this belongs to, but I thought I would start here. The plumbing under my kitchen sink between the garbage disposal and the wall fell apart earlier this week while I was washing dishes. I called a plumber, who came and said that the garbage disposal and plumbing had been improperly installed and the drain and disposal were at the wrong levels. He was able to give me a temporary fix so I can use my kitchen, but said that the kitchen plumbing has to be completely redone.
I bought my house earlier this year and have an American Home Shield warranty that (thankfully) covers this fix. What it doesn't cover is cutting into the back of the under-sink kitchen cabinet to get to the pipes. I am not sure if this is something I can do myself or if I should hire someone. I have no clue how thick the cabinet is, nor do I know how close the pipes are to the wall behind the cabinet. I asked the plumber who would do the work if I could pay extra to have them cut into the cabinet to access the pipes. I was told absolutely not. I've got no woodworking experience, and the area under the cabinet is really tiny.
I also have very little confidence that things will be as they should back there. The person we bought the house from had contractors do some work on it before we moved in, and the contractors were definitely amateurs -- especially in the plumbing department. We've already gotten several incorrect plumbing installations repaired, thankfully most of them before we closed on the house.
Should I call someone, and if so, what kind of professional? If I took one of my saws to the back of the cabinet, would I be likely to cut a pipe? I do very much want to use my warranty for this repair -- I imagine this would be an all-day job for some plumbers, and I'd prefer to pay my warranty copay of $60.