Compressor is showing ground fault

Question

Today I had some plumbing that was done at my home and the AC unit had to be disconnected and moved. The plumbing contractor hired an AC contractor to move it. After completion of the plumbing work, the AC unit was installed and the breaker kept tripping. The AC contractor said that the compressor went out. There was no prior problems before this action.

I firmly believe that something was done wrong. Do you any suggestion or comments as to what could have caused this?