Some juice may have leaked down into the connection between the tank and the mod causing it to stay stuck down and not connect completely-- I would clean it with ETOH and q-tips and SUPER gently pry at it the tiniest bit to see if it will unstick. You might not even feel it if does so I say again if you try it, REALLY gently.
I am guessing this is your main problem although heat affects metal too so whatever type of coil you had in there, I'd say remove and replace.
Good luck.
Anna