Plastic housings and connector in a Golf 110 diesel

[Nudist]

This is the final post following a coolant leak on my Mk V11.
I posted two threads (1) when I asked for help to identify the source of an Elusive coolant leak (2) and followed this up with a post after my car broke down on the way to Melbourne with a major coolant leak on Friday morning called where is my coolant leak occurring? I was half way between Albury and Wangaratta and wanted to get the car fixed on the same day if possible.

The local VW dealership was located in Albury and they could NOT see my car until 19 April so they say. To cut a long story short, the flat bed truck for the haul to Wangaratta cost $234. The [B]VW GOLF VII 5Q0122157CE which is only available as part of a $87 hose assembly and would not be delivered to Monday. I had a public transport weekend. I don’t want another public transport long weekend or week away even further away from home.

A shout out to Karl’s Auto in Wangaratta who specialises in diesels. He mentioned there are a few dozen plastic components in the coolant system and this one probably failed because of its close proximity to the turbo, which he surmised shortened the life of the thin walled venting tube, which has now failed at 190k . (see below)






So my question is this.
Should I go through the coolant system and replace some of these plastic parts especially those that are more susceptible because of their location before they fail even if they are not marked as service items? Which ones?