Hi Bought house with old Stardance D25 Vermont Castings gas stove. Works fine save for... Two queries please. 1) Trying to find serial number. Said to be on back of stove. Stove is near wall so viewing with mirror and all is backwards. And lotsa numbers. What would a serial number look like? 2) The valve called "regulator" does nothing. Flames do not go up down as I turn it. Is this a simple fix or do I call a repair person? How can turning the knob do nothing? Thanks.