I've stripped and sanded Hetty's rear doors, but the right hand door is showing signs of rot around the handle area. The worst area is hidden by the panel when it's screwed on, and there's a small area showing on the front of the door right next to the handle. (I can't show pictures as I use an iPad and it won't let me upload from there!

I've had a good look and poke round, and taken some advice, and a permanent repair doesn't seem possible. Both rear doors are a bit tired looking though the left hand door is rot free and looks better now it's been sanded. I've done a basic repair on the RH side that won't be visible, but the door/s will need replacing at some point.
I don't really want to buy brand new doors as the rest of the wood has a nice patina and I think they'd stick out like a sore thumb?
Do secondhand rear doors come up very often?
Thanks!
Emma