Good question, but being in Malaysia is it plausible that:
1) staff in the service centers are 'selling' parts from their inventory
2) the independent shops are swapping out parts from other watches to use
There was one story I recall from years ago, and authorized Rolex dealer in Georgetown Penang, they had one staff who is the only one there that had the knowledge to service the watches, but every time a Rolex came in, he would take off a part and replace it with some clone, in the end he could build a complete Rolex and sell that off. Not sure how true that is.
If Rolex do not sell parts, how do independent service centres service your Rolexes?
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