Ian is a trader on the forum , excellent guy here is the thread http://www.350z-uk.com/topic/103544-350z-vertical-tonneau-cover-boot-divider/page__hl__tonneau
My understanding of these are
P1 Service - Engine Oil and Oil filter
P2 Service –Engine Oil, Oil filter, Air Filter, Brake Fluid Change
P3 Service – Engine Oil, Oil filter, Air Filter, Gearbox Oil, Differential Oil, Brake Fluid Change