Here is a post from another thread. It might not be the tubing but it could be lightning blowing the capacitor that is required to start the motor.
When your AC goes wrong or you need a tune up most of the big AC companies send out a sales person. When you insist on having it repaired then they will then call out the repair person. I use Greg Theorides - he's an independent AC repairman - when our AC quit last year he came out and installed a new dual capacitor for $100 - checked the gas and other stuff while he was at it - 20 minutes no nonsense. Allan.