Perhaps related....my Limited with Lux2 probably has the same seat frames. The adjustable lumbar mechanism has a pop when adjusted in certain positions. I've played around with the lumbar position and in some positions the popping almost goes away while other positions pop worse. I suspect it is inherent to the design. I had decided to live with it but if anyone finds a fix, I may have it serviced. My general perception is that dealers break more than they fix at times so I avoid the service department.
2009 Murano LE AWD - Traded
2003 Excursion 4x4 7.3 PSD - DIESEL
1985 Mercedes 300SD - DIESEL
JGC LIMITED 4x4, CRD, MAXSTEEL-BLK/FROST INT, LG2, ORA2, BLK HTR, NAV., CD - DIESEL!
Harley FLSTFI '04