Hello...I HAD A FURNACE REPAIRMAN LOOK AT MY BOILER FOR ANNUAL MAINT. He said i needed to replace the combustion chamber as it was falling apart. The bolts holding the cover of the box are rusted on and may break upon removal and suggestions. Also how much and where is the best place to get a new combustion chamber.It is a model no.p-368v-w , should i replace the boiler or have them fix it ? Do you think the company would warrenty this for me or not ? Thank you very much in advance. David.