He can get approved to purchase parts from Rolex but there is a very
rigid qualification process he would have to go through.
I have a AWA Certified Master Watchmaker that does my work who had
to requalify and even had to send pictures of his shop and equipment.
Then had to buy an additional machine (amplitude meter to the tune
of $3000.00) to be approved.
This is a 3rd generation watchmaker with 60 years experience who
does repeaters, complicated and even Atmos Clocks for fun.
This man could teach Rolex a thing or two!!!
Good luck to your friend