Air in the jets means air is being sucked INTO your piping. The only place this can happen is in the piping in front of (upstream from) your pump. Suction leaks are notoriously hard to find, since there is no visible leak, only a spot where air is entering the piping.

It's quite possible that the contractor jostled your pump around, and worked a joint lose. Start checking at the pump lid, then the fitting screwed into the pump, then the valves and piping (suction side) that are above ground.