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Thanks Andrew for your help, yes it was a problem with the left slew button.
3 years ago the handset buttons were not working they had lost conductivity on the contact points so i fixed them with a carbon glue button contact repair kit as recommended on "cloudy nights" forum for fixing this problem, the keypad has worked very well since but this week one of the 2 contacts for the left slew button had lost the repaired carbon glue contact and it was floating around in the button randomly shorting out the button contacts.
All fixed and repaired now and working well again, thanks Wayne.
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