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Hi, I'm Mike G and I'll be assisting you. You need to test wires on the incoming feeder on both line and load of the main breaker for 240V. You also need to test from line to the neutral for 120V. Let me know the readings for comment.
Turn all the breakers off and test lug to lug on the breaker and then each to the neutral.
Get up there???? You shops be testing at the panel.
Typo --- should
Let me know the reading with all breakers off as directed.