I recently inherited my father's JBL L250 speakers, the ones I grew up listening to in the 70's. In the 80's my parents had them painted black and now I want to restore them to their original natural wood finish.

The first thing I noticed when starting to formulate a plan is that there appears to be a panel on the back opposite where the high frequency dome radiator is housed but there doesn't appear to be a way to remove it. Any ideas on how to remove this before starting to refinish the cabinet? Any other advice/guidance would be appreciated.

Also: the wire mesh dome grills are dented. Do replacement parts exist for this speaker? My father bought these new and I don't think they have ever been serviced. They still sound good.