Display exchange at Motorola V3690 and rescue bathed V600

Hi, friends!

My wife has made her 9 month old V600-Motorola mobile a gluey bath in Capri-Sonne drink, after that it is mouse-dead. For this reason I must make her old V3690 fit for use .
This old mobile has worked perfect over some years until the connection between display and case has been broken.
I have already purchased a new display at E-Bay, but I do not know how I should install it in the mobile. First, I don't know how I should open the mobile (both parts?), in order to exchange the Display.
Could somebody be me helpful with a service-instruction or with a sketch?

Another question: Is the killed in the gluey bath V600 still reparable?
I seems that only the keyboard area has been affected by that bath.Could I risk an ultrasound-bath of the whole device in this case?

Thank you for your help in advance and most cordial greetings - WLL