Many thanks it sounds as if the HC ¡°flex¡± button has gone bad. ?
You can test that with a multimeter on ohms. ?I can write for you a procedure to test the flex, buttons and how it all works ?
I do have some diagrams on my Google drive I can access and place up (drawings written guide) but are limited as am in hospital (and will be for a little while, only got out ICU (again) 2 days ago ¡.not unusual for me!).
But it gives me something to do and infact the way these buttons work is simple but time and moisture is ravaging them. ?
But you can test them in the HC (with multimeter on ohms and volts) and connected to the system on the main board ? IMHO this is looking less like a cable issue but I don¡¯t have full facts to say this yet ?
cheers
Brendan