First thing i checked was fuses before disconnecting battery, then attempting reset via control switch,as i stated in post i cannot access boot to get to the pump/control module..i need advice on how to access boot.

Reboot here. https://youtu.be/hvxQfG812wY That said, if it was previously making a noise, suspect broken nylon cog on the motor or such like. Trouble with these infotainment screens, is the dash is under constant heat in summer, so any grease will dry out. Search YouTube. Couple of videos they’re accessing screen by removing air vents and accessing screws. You’ll need plastic anti-marr trim tools.

Have you checked the fuse? Pretty sure you can manually over-ride. The hydraulic fluid reservoir will be in boot, etc. https://youtu.be/XQsxjGBmEeg?is=upf2_ZM2pLvaf6FR

On sites, have used Euro Car Parts and basically collected. Autodoc is good, however will take at least a couple of weeks to arrive. Avoid buying direct from Germany. I used to use Hubauer Shop for genuine BMW kit, however they don’t add tax, so you pay Royal Mail to release. That’s Brexit for you.

Have used Febi before, top mount for wife’s BMW i3, VW brake shields, that sort of thing. A 3.0 TDI is a different kettle of fish though. I have an A4 Allroad with 3.0 TDI, so know it’s heavy. Pretty sure the front and rear (front suspension) lower arms are hydra bushes, so basically fluid filled. Lemforder as you say is OE. Only other thing I’d consider is Meyle HD as comes with 4 year warranty. I broke a rear spring on my car and fitted Lesjöfors after cross checking part numbers. Car is jittery as anything, so that’s all coming back out and I’m fitting genuine Audi. With suspension, don’t cut corners. Not saying Febi is bad, but those arms will last fraction of OE Lemforder arm, plus you’ll have labour again to swap out.