yaesu ft3dr

I have lost the lower dust cover (that covers the microphone and power connections) on my FT3DR and am looking for a replacement. I have a tech-request into Yaesu to see if I can buy one, but I'm thinking someone out there has a non-functional parts-only FT3DR and could sell me the dust cover...

I'm wanting to continuously leave my FT3D radio powered on at my desk for monitoring but also for occasionally transmitting. The manual doesn't make it clear, but is it okay to use the SAD-25 ac adapter (10.5v 1amp) plugged into the DC port for this? I first turn the radio on, then connected...