5wheels

I have 2020 Octavia 150 Se L First Edition. I would welcome comments on the following: a) from time to time I get a double crackling sound which comes from either the info screen or the overhead box. It appears to be linked in some way to the sound system. Any thoughts/explanations welcome. b) is it worth getting the car serviced at a Skoda dealer (John Clark Dundee in my case) now that it is 5 years old and only does c.5,000 miles per annum? Would a local garage have the necessary diagnostic equipment? c) is it worth getting the satnav updated? d) how do I change the display in the centre of the speedometer and rev counter? At present they are showing miles to empty and the radio station respectively. I am sure they Many thanks for any help. 5wheels