[Ashmere]

As part of trying to relieve electrical issues I am going to remove the CEM and clean all the contacts as a poss cheap fix.
Do I need to leave the battery disconnected for any period of time before commencing?
Is it just a case of remove/clean/refit?
Once refitted is there any re-start procedure to follow?
What will I loose radio settings/trip mileage/clock reset?
Any advice appreciated.