Google 'RV Repair Shops near me'. Or 'RV Mobile Tech near me'. Or change 'near me' to mention the town where your RV is parked.
And, go to RVServiceReviews.
I always check here first and read any reviews after searching for repair shops.
One big warning, avoid Camping World service as they'll most likely keep your rig for months and often return it with more problems then when you took it in.