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Is the breaker for the pump tripped again? If not then the next most likely culprit would be a faulty or clogged pressure switch
It's common for the small diameter piping to the switch to clog up with rust and sediment. If he didn't clean out that piping when he replaced the switch then there's a pretty good chance the switch or the piping to it is clogged. The switch will have to be removed to find out. If the switch is ok then you need to watch the pressure at the gauge near the switch. Is the pump short cycling; ON, OFF, ON, OFF in a short period of time? If so then the holding tank is either water logged and needs to be drained (if it's an old tank with no diaphragm) or the tank will need to be replaced if it's a newer tank with a diaphragm.
If you have short cycling it's almost never the switch. Short cycling is caused by the loss of the air cushion in the holding tank or a broken diaphragm (which maintains the air cushion) in a newer tank .
You need to shut the power off to the pump before draining the tank. Open a faucet above the tank while you drain it to let some air back into the tank. Draining the tank only works if it's an old galvanized tank. If it's a painted tank then it has a diaphragm and you'll need a new tank.
If you have a blue tank and you're pump is short cycling then you'll need a new tank. But before you replace it take a screwdriver handle and rap the side of the tank with it. If you get a dull thud from bottom to top then it's full of water and you need a new one
Yes this is another clue pointing to a problem with the pressure switch. There are other possibilities (failing pump, an intermittent wiring failure) but a clogged switch or piping is the most likely and least expensive to fix.