Hi David,
Just get some 2SC2240 transistors. They are an improved substitute with the same pinout. Still current would be KSC1845, which would do well in that application. The Digikey link is : KSC1845FTACT-ND at $ 0.44 each CAN, less in USD. Digikey can get them to you in a day I bet. I get things in one day and I'm in Canada. I'm sure Mouser and others have the part which is made by On-Semi these days.
-Chris
Installed the new replacement transistor and it as well heated up. After much searching, the problem turned out to be a physical short that developed between two traces. The original transistor, as hot as it got is still functional. Problem solved. Thanks for your advice everyone...