Can you explain what you mean when you say the keypad sticks? Are you suggesting something along the lines of a sugary drink has been spilled over the keypad causing the actual buttons to be contaminated in some way? If so, this would be a case of isloating the power and stripping down the keypad, popping out the rubber button mat and giving it a good clean with Electrical Contact Cleaner spray.
Rupert
March 2020
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