On our house (2013 Gardenia) the door bell transformer is on the same circuit as the attic light, so turn on the attic light, and start turning off circuit breakers one at a time until the attic light goes out, then try the door bell to confirm.
On a side note not sure why you need to turn this off, the voltage to the door bell and the switch is less than 24 vac, and typically around 18 vac which is very easy to work with and if you accidently short the door bell switch wires all that happens is the door bell rings.
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Pennsylvania, for 60+ years, most recently, Allentown, now TV. 
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