I'd be checking the ignition switch....
Only way to find a battery draw is to disconnect the negative battery cable, then connect a test light to the cable, and the other end to the battery post. Key off, if it lights up, you have a draw. If it lights, start disconnecting things one at a time until the light goes out. Isolate that circuit and repair the bad part/wire. If it doesn't light up, you either have a bad battery, or a charging problem.
Or do as Sam suggested.
Dealer likely doesn't have any mechanics smart enough to fix an electrical issue. Especially if they replaced the ignition coil to fix a draw. Not related in the least.
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