@ Raptor - that is correct. Now look at your Ops Manual Part A Ch.8 - what does that say?
Basically - if your 135/121 company decides that something needs to be done, it does not matter one iota if Boeing say 'no need to do that'.
I've also operated a type where the OEM De-icing procedure stated 'Pitch Trim - full Nose UP'. I politely enquired if that was something they had thought through? "Yes - the nose of the stab needs to be up in order for the fluid to not.... ahem.... yeah, that'd be nose down, wouldn't it.... Ahem.... SBY for an AW!" - which was issued about 5 days later.
Point is - there is what the OEM says, and there is physical reality. At the end of the day, the latter always wins ;-)