Thanks for the tip on JVB. I have contacted their Holland unit. They would not commit on a M596. They have requested photos of the main board prior to confirming an upgrade. Incidently, they gave the same response on a Meridian 800. At the moment they will only modify a M598. I'm going to sort out some photos and see how far I get. I'll report news when I get some.

Cinema: DSP750 x3, DSP3300 x 4, DSW.2 x 3, Trinnov A32, 271, Oppo 203, Toshiba HD-DVD, SKY Puck, Sony XW7000 PJ, Screen Research AT, Kaleidescape 4K 30TB
Lounge: 861v8, 808v6, UHD722, DSP8000SEPP, DSP7200HCSE, DSP3300, DSW x 2, 504, C15, Sony UBP-X800, SKY Puck
Bedroom: DSP5200SEHC, G65, UHD722, G08, DSW, M6, C15, 210, SKY Puck
Spare: 818v3