Piss poor add-on is what that is. You can see the line of the hip. The only way to fix that right. Is to take the shingles and decking off. Take the old hip and jacks out and run new rafters from ridge to the plate. Then re-deck and new shingles.

Well I took a good look today and everything looks fine underneath. The whole roof is OSB but looks good. This roof extends over a room that was added on and it looks like the bulge runs perfectly with the old roof line. Everything looked solid and dry underneath. I talked to the people who put the roof on and it still has another 2 years on the warranty.

Yea, I talked to the roofing guy and he said it looks like the newer roof addition has shifted down alittle. Talked like it could be fixed for around 500 bucks. Just needs to cut and refit the shingles. He said something like the papers 4 feet so if its longer than that than its not a paper issue.

if the bump is at the new roof addon then again RUN, this is an indication that the tie in is not right. with the osb and a bump like that I stand with the water problem too, osb will bubble on one side and you can't see the other one where the damage is. the roofer is full of s--t on the repair too just doing the shingles will not fix it.
my advice is look for another house with the heatpump problem and roof this is gonna cost ya down the road and it won't be cheap.