[GreenKeys] Model 28 buzz

[Radio AI2Q]

My Model 28 is always connected to the AC line, but not activated until 
I turn on my local loop and place the lever on the right-hand side on 
(up)..

Today we had a power outage, and when the power returned the Model 28 
emitted a loud continuous buzz from the device to the right-rear of the 
internal deck (next to the relays).

Can someone tell me what the cause is and how to return to normal 
operation? The right-hand lever does not affect this problem.

Thank you.

Vy 73, AI2Q, Alex
Kennebunk, Maine

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