Mine died a few days ago too. I reported it in the technical forum. Here's a PM from Hugo about it.

In reply to:

It's a SO-8W dallas DS1821S, ISTR it's somewhere just behind the RAM chips - quite a wide chip.

It's surface mount, and so not desparately easy to replace; you may be able to get free samples from www.maxim-ic.com though. Personally, I wouldn't bother replacing it, as it doesn't really perform any useful function wrt to player operation!

Hugo

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Marcus 32 gig MKII (various colours) & 30gig MKIIa