Spray the handle area with wd 40 I believe there is a micro switch there.
Failing that I am sorry to say you will more than likely have the dreaded broken wire issue inside the rubber tubing between car and boot lid.
Only thing to do is cut open the rubber tubing without damaging the bung ends where they go into the metal body. dont be supprised to find more than one wire broken, the wire quality is sh*t.
Good luck.
Ade:wave: