I recently purchased a used 1502 incubator, plugged it in got it set to temp let it run empty for 3 days. Set eggs and a weekish later went to candle the eggs and got shocked from the latch on the door. I then had my boyfriend go through the unit to make sure there was no short or something wasn’t grounded out properly he couldn’t find anything wrong with the wiring on the unit. He put it all back together and he got shocked from it still. So my question is what is going on with the unit? And what parts or what do we need to fix in order for it to work so I can hatch? Thank you!!