I have a E320 year 2000 and need advice on instrument cluster removal and bulb replacement. I have eased out the cluster from the dash and see that there are electrical connectors attached. I'm assuming they need be removed ,I can't feel or see any bulb holders . Do I need to remove the back part of the cluster to replace bulbs. Should I disconnect the battery first (is there an easy way)
Also need to remove a air vent to replace buld which illuminates vent directional dial

Thanks Brad