A mate had the same problem with his 48, took HH a week to fix, is it only happening to the 48's?

T1

 It actually applies to all HDs (except VRods) built between October 1, 2011 through March 31, 2012.  Here's a link to the service bulletin from HD

No worries! Might be good to post this in the general section in case others are affected.