I did! The part is listed in the schematics, which turned out to be exceptionally easy to decipher once you put your mind to it. Smoking the transistor was the result me troubleshooting by swapping the coils around and hooking one up backwards. Soldering in a new one was pretty straight forward if you have done circuit boards before. Can't say enough good things about the Kohout build quality - you get what you pay for I guess.
In the end, the issue turned out to be the jet bumper coil which would short only once it started to heat up. At least that is my best guess. I still have that coil on my shooter lane kicker, where it doesn't get the same workout and it seems more or less fine. I currently only have one new coil. Once I put it on the jet bumper - the issue of the IC17 blowing after 5-10 minutes of game play disappeared!
In my internet troubleshooting travels - I'd read several times the chances of a coil going bad were slim. Well... I definitely had two coils be the root cause of some very difficult issues to track. I've read people dissuade newbies from re-coiling old machines and to replace the mechanics and sleeves. Fine. But when the machine hits 30+ years old with original parts... switches and coils start to go. I've learned the hard way on this point. Neither bad coil shows a low resistive load either! Both test perfectly fine, but would blow a fuse and some circuitry after some use. EVIL!
But I've learned a lot about this machine in the process. I could have learned more by sticking it out with the original boards. That would have entailed checking all the chips out with a probe to determine which was not signalling correctly. The Kohout boards just light up a diagnostic LED most of the time... so with the provided docs its a cinch to trace backwards to the point of failure.