Laney LC15R - repairs & upgrades

4string

I have seen the LC15/LC15R get some positive mentions on the forum and was wondering what upgrades might be worth considering? Watford do a couple of valve and speaker packages, offering either a Celestion V10 or a G10 Green back. Has anyone here done this mod? Any experiences to share?

I also need a recommendation for someone to give my LC15R a service. The pots crackle, one of the input jacks is intermittent (a common fault I understand) and there is a prominent 50 hz buzz  that occasionally is not there. I am based in East London, so someone close(ish) would be appreciated. Thanks.