Its good to take notice of advisories as they are next years potential MOT fail, although my mate who works in the industry says testers do like to be seen writing advisories as it is seen as 'being on the ball' if and when the inspector calls.
I know the rear brake pipes are prone to corrosion on GD Jazz, as in the area of the rear swinging arms someone at Honda thought it was OK to strip the plastic coating on steel brake pipes back by about 150mm - never had problems with front pipes though. My GD was a Jap built one as well - ----