Our Tribeca was having low compression on cylinders 1, 3 & 5, which was diagnosed by my local mechanic and my own Google search as probably a slipped timing chain due to tensioners being worn. Our mechanic said he didn’t have time to do the repair, so we took it to Don K. service dept., since that’s where we had purchased the vehicle, and told them the probable cause. Don K. said they would have to run all kinds of diagnostics and would cost $200. After having our vehicle for four days and utilizing their so-called best expert mechanic, they said it was probably bad valves and would need to charge a minimum of $3,000 to tear down the engine and repair. I chose to pick up the vehicle, and the $200 charge now was $700 and nothing was fixed! When I complained about the $700, I was told that was heavily discounted. I took it to a local mechanic recommended by my mechanic, and he immediately told me it was probably just a slipped timing chain and fixed it for $1,500. The car now runs perfect!