Realistically I'd say it's time for a new panel, the keypad membranes do come off and can be cleaned if you are careful and use something like Ambersil or a medi wipe containing alcohol.
Check the spring on the inside of the control unit that should make contact with the lid, it may be either missing (on the floor) or not seated correctly, then try to reset again using your code and the 'reset' button.
I understand and agree ref the accreditation as a measure, the motivation should be (only imo of course) to know you are the best you can be. The badges are for the customers but they were not mentioned, only the motivation.
And no, you don't have to justify yourself to me Stu.