Rolex Air King Date - time for a service?

[hopeydaze]

Not very experienced on this so I hope you will forgive the basic questions.

The watch was last serviced 5 years ago and I have just spotted a bit of condensation under the glass. I bet I didn't retighten it properly when I changed the time last weekend.

So would you recommend an immediate service?

Also, last time I got it serviced I took it to a jeweller in Bath where I live and I think they sent it to Rolex. Service seemed fine. However I wonder if this is the best way to go?