I'm very much inclined to have a go myself before spending money, especially as it sounds like it might be a loose connection. There's no harm in having a look for anything obviously dodgy.
Cheers, I normally dive in and have a go at fixing things without thinking much with (usually) good results but........ never had to do it with my guitars before. Being able to find a wiring diagram makes the thought much less daunting.
I'm very much inclined to have a go myself before spending money, especially as it sounds like it might be a loose connection. There's no harm in having a look for anything obviously dodgy.
Most of the online retailers have wiring diagrams e.g. https://sixstringsupplies.co.uk/pages/guitar-wiring-diagrams