I have an older Ring Doorbell 2 with rechargeable battery and a plugin Ring Chime unit. The doorbell works great but the Ring Chime got knocked while plugged in and now it doesn't work. The Blue light doesn't come on so of course, I can't connect it to my WIFI. It's out of warranty but I understand I can buy just the Ring Chime unit. I've searched everywhere but can't find anywhere to purchase it. Can someone point me in the right direction?