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1) In the interim until an electrician can be contacted, I suggest to turn the branch circuit breaker
that controls the GFCI receptacles to the OFF position and leave the breaker OFF till the electrician arrives on site. By leaving the breaker in the OFF position, this will ensure that no danger is present since power will be disconnected to the circuit.
2) In cases like this, it is possible that there is a loose wire connection inside one of the wall boxes that is causing the problem. A wire may have become loose on the GFCI or a splice may have become loose.
Another possibility and depending upon how the GFCI's were originally wired, you may have 1 GFCI receptacle that is faulty and is wired to the other 2 GFCI's, causing those 2 GFCI's to not work and reset.
One of the above is typically the problem found when troubleshooting and making the necessary repairs on this type of trouble.
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