Panasonic DVR (hard drive failing)

Has anyone found out how to replace the hard drive on the Panasonic DVR DMR-HS2, also known as DMR-E30? The folks who have Tivo’s have it simplified, but as yet I haven’t even seen the discussion for the Panasonic product line. I can’t help but imagine it’s also Linux-based.

Of course Panasonic’s fix is to ship them the entire box and shell out no less than $300; which puts me closer to getting a new DVR than keeping my
DMR-E30 going.