I have some knowledge of this tub, as I used to own one exactly like it. I'm with Roger, I would have filled it up and let it run for several days to check for leaks. If it did not leak, I would spend the minimal amount of money to get the heater fixed. In regards to topside controls, mine had the old air controls also, but when my spa pack went a digital control was included ($700 installed in 2003 .) It was a great tub, but mine got to the point where I could not justify throwing huge amounts of money into it. Since you are this far into it, put minimal $ into it to get the heater fixed, stain it up and enjoy it.