I've brought back a few bits and bobs to apple in the past and their motto seems to be we'll replace it so long as the part in question is not something you tampered with.
Example1. Macbook Gen1 cracking case.
I'd already replaced the Screen myself with one I bought from Ebay (and made them aware of it) they still replaced the case regardless.
Example2. Ibook trackpad / keyboard issue, I'd replaced the CD drive with a superdrive myself 6months earlier.
Example3. CD Drive Dodgy in Mums Imac under applecare, they replaced it even though I'd been in there before and replaced the HDD.
Optibay is a less complex but more visible and might be frowned on moreso as a result, but they seem to be pretty cool with tinkering.
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