crank and catch replacement
Thanks for your post! It does not appear that the cover of this crank operator can be removed, so the entire mechanism will need to be replaced. That be said, I suggest reviewing and comparing the 39-253RB and the 39-439B Encore Dual Arm Operators. You'll need to carefully review each of their dimensions and the hardware used with this operator to determine which of these is the correct replacement.
I've tagged the compatible cover and handle kits below. You'll find the other compatible hardware in the 'related products' section for each operator.
The window lock looks similar to the 38-208 Handle and Escutcheon, made by Truth Encore. To determine if this is the correct replacement carefully review and compare the dimensions below.