While the camera is still ok, the plate holder is really warped.
The lens (Rapid Aplanat) was also suffering from the moisture too, having developed severe fungus. Have a look:
|the lens taken apart|
|one of the groups|
|the diaphragm at f/64|
I wiped down the front and rear surfaces of the front and rear groups with alcohol using fresh a q-tip for each of the surfaces. Said wiping down is to be performed in a meandering fashion, starting from the middle of the lens.
My Rapid Aplanat is now as clean as clean can be. There are no visible traces of the fungus left.
Next step: make a plate (film/paper) holder.