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Welcome to Just Answer, my name is ***** ***** I will do my best to help you with your issue. First I’ll need some more info so I have a more complete picture of you situation.
Is the water level in the boiler stable while it's making steam?
There should be a sight glass on the side of the boiler. You need to watch the water level in the glass while the boiler is firing and making steam. Is the level relatively stable or is it bouncing wildly up and down in the glass?
If the water level is bouncing a lot ( more than an inch or so) then the boiler water is dirty. Sometimes just draining the boiler and refilling it (be sure you turn the power off to the boiler first) will solve this. If it doesn't solve it the boiler needs to be skimmed which is probably a job for a plumber. Another issue that could be contributing to your problem is that the vents are not installed properly. They should be installed on a nipple that rises several inches (we use a 6" nipple) above the main.
Knowledge of steam systems is pretty scarce these days. Skimming the boiler is supposed to be done when the boiler is new but if it isn't done then or done properly it can come back and be a problem. Skimming is needed to removed the oil and other contaminants that float on top of the boiler water. They cause the boiler to surge, water level to bounce. I don't know about Sears but replacing return air vents is a standard part of any steam boiler replacement we do and any competent company would/should do. The response you got from Sears indicates a complete lack of understanding of how steam systems function. Before you call the know nothings back try draining and refilling the boiler yourself and if you can replace the vent you should be able to extend them. Just get 6" long black nipples and couplings and screw them into the elbow and screw your vent into the coupling on the other end of the nipple.
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If you can't get the nipples at Home Depot go to a plumbing supply house.
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