Servicing recommendation around Lymington

[Ruby Tuesday]

Good morning. We are returning from IOWight today and had hoped to spend a few days around the Lymington area. But, we have a problem with gas to our water boiler heater which hopefully can be fixed by clearing an air lock. I’ve tried all I can.
Any ideas on a caravan/motorhome servicing garage I could pop into in the area would be greatfully appreciated. Thank you.