A:AnswerMake sure dimensions are same or really close if its bigger it wont fit. Basic hand tools such as a drill, tape measure, etc. will get the job done
A:AnswerCould be excess machine oil in the blower fan motor just burning off, if it doesn't smell like electrical or plastic it may just be temporary while its new. I'd watch it carefully though and make sure it doesn't continue to smoke or get worse over time. Maybe call GE or check if anyone on the internet has posted this problem. Good luck.
A:AnswerMicrowaves have a "stirrer" which is a spinning metallic plate in the top of the housing that disrupts the microwaves and bounces them around the oven's interior. That and the rotating turntable are supposed to help heat things more or less evenly but sometimes there can be hot or cold spots, try putting the containers you are heating not exactly in the middle of the turntable, if it consistently not heating evenly perhaps the stirrer is not functioning.
A:AnswerProbably not required, but likely recommended, otherwise your vent pipe might over time start to develop odors from things like fish that would be neutralized by the charcoal filter. Check your owners manual to see if it has any recommendations. I just replaced my old internally vented one that didn't even have a charcoal filter installed, never really noticed a problem but did notice a bit of residue from the fan exhaust on the underside of my nearby cabinetry develop over time.
A:AnswerMine had a little buzzing sound on one side when first installed that I fixed by tightening the mounting bolts and then wedging a bit of foam insulation in between the side and filler panel near where the sound was coming from, sometimes any appliance with a motor will just vibrate like that and anything that dampens that will fix the problem. Also, the blower fan might be running at the high setting, I'd check that. This model does have a fan that runs automatically but I think it has more than one speed.
