I have a manual that states that if the model # contains a T in it, that means it has a triax control board, which I found out is B.S., I am working on the one mentioned above and this thing has solid state relays, which were put in production in the EFRI models. Anyways, since no one had an answeer out there, I busted my ass and got very greasey to find out that some moron installed the previous solid state relays with one (1) screw in each relay (which are mounted on a heat sink, get it, no heat disapation) reslulting in a relay melt down, which made this thing keep heating beyond the point of no return. You guys will probably never read this due to the amazing response from the request about a month ago. Happy New Years!