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Good afternoon, my name is ***** ***** will assist with your query.
In the vast majority these old Panasonic PABX are uneconomical to repair as the circuit boards and modules are either obsolete or more costly than replacing the entire system.
You can buy a second hand unit (same model) on ebay here for £10, alot of the cost can be in setting the new unit up, so you may be looking at a few hours effort for an engineer, however if comfortable you can do it yourself following the manual here.
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