Hi Petric, have you seen this?
Hopefully this helps :)
Sure thing let me know how it works pit for you
what kind of door bell you have ?
here is a video that may help you
Wired or wireless?
What is wrong with the door bell?
If you decide to replace your doorbells, you can replace it with a "smart" Ring doorbell so you can easily see via video who's at the door. They look very simple to install: https://www.youtube.com/watch?v=xxSJ5nO4b48
Here is a video https://www.youtube.com/watch?v=JRBvPAU6_LM
The transformer likely went out or came loose. They are relatively Inexpensive and easy to replace. https://amzn.to/2XjUixS
Hope this Helps! Jeremy - https://pahjodesigns.com
Thanks to all of you for suggestions! It's solved!