Brown water leaking from boiler

I have a potterton boiler that’s leaking water from under the control panel.
Just seems to be a few drops every few days. It seems to be working otherwise.
Worried it’s on its last legs. Any ideas?

Thanks

 

Here’s the front if this is needed

 

just get someone in to service it and mention the water marks, very unlikely that you will need a new boiler

 

Unless you get British Gas

 

Thanks!