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you shouldn't have to check the pot if its a new laser and if it is a new laser then check for the anti-static solder point. almost all ebay users remove these now but there are a few that leave them on there. http://www.ebay.com/itm/Phillips-Benq-DVD-ROM-Drive-Xbox-360-VAD6038-FW-64930C-Lite-On-Compatible-/150899986090?pt=LH_DefaultDomain_0&hash=item2322570eaa i usually buy from them and dont have problems, if i do, they are some nice people that will work to get the issues solved.
http://www.ebay.com/itm/Philips-BenQ-VAD6038-6038-DVD-ROM-Drive-Replacement-For-Xbox-360-XBOX360-Repair-/200795247391?pt=US_CD_DVD_Blu_Ray_Drives&hash=item2ec054531f you will need to use your motherboard from the drive or flash your key to new one