Panel looks like 100w to me, not sure about the controller, if it works it'll do for a while easy retrofit for an decent MPPT 3 (swap the one you have in hank for it) add a matching
battery if the dates agree with it being new ish.
The leaking window might just need a new seal, lift the pane up from outside and see if it's damaged or not, not the best windows as I said.
That waste drain tap looks like it's falling off to me, easy fix for your man though.
Truma error code:-
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www.atlanticcaravans.co.uk
I have the same reversing camera, not the best but they do the job V1/V2 toggle switches from down view to rear view.