I just got a replacement neck installed on my fender p-bass. The neck is an official p replacement neck from fender. My luthier replaced the neck and made the appropriate adjustments to the bass. After playing the bass for one 1 hour, I noticed the action had risen, and by the next day the action was so high it was unplayable. After that happened I had my husband set up the neck again. (not wanting to take it back to the shop because they take forever and I had already waited 3 months for fender to send me a replacement neck) He did an ok job, but the action is still not as low as I would prefer. The neck adjustment is set correctly and Ive lowered the saddles as much as I can. At this point Im at a loss. The nut height seems to be relatively high, but I dont know for sure because Im unsure of the correct measurements. Any suggestions or help would be greatly appreciated.