- Annual Maintenance Visit - Replacement of a transformer for the doorbell. Doorbell transformer was located behind the chime that was upstairs. Transformer was replaced and was reading 24V upon departure. Ring doorbell was also working as intended. During the maintenance visit I noticed backstabbed devices and also a missing surge protector inside the panel. I recommend getting a redevice and installing a surge protector. Also, customer has been taught how to maintain her AFCI Breakers by testing and resetting them. At this time customer was not interested in moving forward with a surge protector or redevice.