Materia HELP PLEASE

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HI
I am unable to remove my wiper arm for mot .. as it has stopped working but I cannot seem to get it off.
For months it would randomly work/wipe but now nothing ... can anyone tell me how to remove without busting it ...
Also I had a repair on my car on the body below rear boot door then the locking soliniode to the boot stopped working .. unaware if when they did at garage or after.. I took bAck to the body'shop and they couldnt work it out .. so now I have to manually lock it speratly.. does anyone know were i could get the part cheap and won't coSt me the earth ...
Thank you so much ...