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I see you raised the question some time ago do you still require assistance?
There is no additional charge to answer the question you need not worry about that, you may be seeing an automated advert for a phone call (but this is just an option, and note required for me to answer your query).
Give me a short while to double check the known error database.
It suggests the phase button may be faulty or the wiring to it being faulty. Its very unusual for faults to crop up in the first couple of years, I have checked and there are no known issues logged on checking the engineer portal relating to this setup. It may just be the switch was faulty when fitted or has been knocked in transport which has made it intermittent.
A new switch would cost less than £5 in parts, and can be fitted by most electrical engineers music repair centres, but wouldnt be covered under a warranty repair.
Please let me know if you need anything further.
The switch is showing as a serviceable part, so there must be a way to access the switch, PTFE spray or switch cleaner may work but would think its likely a mechanical failure based on it going faulty early on.
Let me know how you get on.
Do you require any further assistance?
You would need to strip it down and look up the switch in rapid electronics or rs components. They don't provide the part number at the indervidual component level.