Problem: DVD-RAM can no longer be read on MBP C2D

The "MATSHITA DVD-R UJ-857D" in my MacBook Pro C2D is said to have read (but not write) support for DVD-RAM media.
During the first few weeks of its lifetime, reading DVD-RAMs definitely worked. But now, no more, no matter what brand of media I try.
All other types of optical media continue to work as advertised (read and write).
I wonder whether this is a physical defect (but then why doesn't it affect other types of media?) or an issue caused by recent sopftware updates (but when I boot from an external DVD-drive using the very original MacOS DVD with no updates at all, why do I still not get read support on the internal drive?).
AFAIK there has not been any recent firmware update for this model. So what can be the reason? Should I let Apple swap the drive? Has anyone else observed the same issue?
Guido
MBP C2D Mac OS X (10.4.8) MATSHITA DVD-R UJ-857D

Hey Grant,
thought you'd like to know my "cleaning the lens with a cloth" worked fine - uh... but for about three days only, then back to the same old, same old.
I'd originally slid a business card covered with a lens cleaning cloth (from my camera bag) to clean the lens, and although the cloth emerged mostly pristine, I figured it must've done the trick as the drive started working again.
So this time, I decided to go in deeper. I actually took the whole drive apart - case off, drive out, drive dismantled - and I had a long look around to see if any parts looked dirty or damaged...
I found just one thing - the small silver rod on which the read/write head travels (the servomechanism that moves up and down the disc radius as it reads/writes) had some 'oily gunk' at the point where the travelling-head's 'sleeve' met it - when I tried to move the head manually up and down the rod, it sort of staggered along. So I cleaned off the gunk with a cotton bud and then slid the drive-head up and down a few times 'till it seemed to run freely.
Put everything back - and fired up my Mac Pro. And the drive has been 100% fine since then - two whole weeks!
Maybe this time I've cracked it? (for my drive at least)
Roger

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Message Edited by bodmaster on 07-18-2008 09:51 PM
Message Edited by bodmaster on 07-18-2008 09:52 PM
Message Edited by bodmaster on 07-18-2008 09:52 PM

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Hey Grant,
thought you'd like to know my "cleaning the lens with a cloth" worked fine - uh... but for about three days only, then back to the same old, same old.
I'd originally slid a business card covered with a lens cleaning cloth (from my camera bag) to clean the lens, and although the cloth emerged mostly pristine, I figured it must've done the trick as the drive started working again.
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Problem: DVD-RAM can no longer be read on MBP C2D

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