frigidaire gas dryer FSG446RHS1...doesn't heat, cleaned top to bottom including behind drum space that collects lint...when rotating, gas is to heat dry cycle, instead it makes a sort of grinding sound (not related to drum rubbing on as it turns) do you know what it is, how to fix or part most likely needs to be replaced before i spend all day checking contact points, etc...i have tools, knowledge, just not specific answer