If you decide to use new vacuum tubing, this link may help:
https://www.belmetric.com/metric-hoses-polyamide-hard-plastic-hose-c-14_184.html
I hope others will step up to help you. The access is a huge problem and it is easy to dislodge other things when forcing your hand into the tiny spaces.You will shed blood for this !
The other problem is the routing - that is why I mentioned the color coding and upgraded materials.