The flash tube for these kinds of units are not user changeable- high voltages and electronics technical expertise are required for safe and successful replacement. Find a qualfied service facility through your dealer.
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My first impression is that you are using the flash at its maximum capacity and completely draining the charge each time. I'd also say that you are only going to get about a dozen flash burst before the batteries are exhausted. I use several Vivitar 283's 285's and a couple 285HV's in a portable studio set up I have and the 285 HV's have got to be tuned down about 1/3 before I can get them to match the other flash outputs. If I need all out brute power then the 285HV's are used on full inside a softbox. I generally work with a 16 batteries between the two 285HV, also they need good fresh batteries off the charger. On a photo shoot I'll get maybe 15 shots before the power is down enough that I change then, I'd say powering back up it'll take about 15 to 20 seconds before they come out.
Sounds like something overheated and fried. I suppose you could take it apart to which part looks black. Prolly needs a new circuit board and/or capacitor. Not sure what the repair cost would be, since it seems Vivitar is no longer in the flash business. Best bet: buy another 285HV on Ebay, either broken, for parts, or for replacing your dead one. Keep your old one fer parts.
Personally, I would not try it. While the Canon has a protection system built into the camera, the trigger voltage on the Vivitar is pretty high. I have had good results using a 283 on a slave shoe, you will have to stop down more with the extra light