Hi Liam,
I chose to change mine for new unit bought from frf Volvo.
You will see threads on this forum from members who have stripped and cleaned them or replaced with second hand. It appears there are optics in the unit that can either get dirty or deteriorate.
I wanted mine changed by my indie and to be sure it was fixed 100% at the first opportunity.
You need to be sure you get the correct part, I understand they changed about 2006. This is why I purchased via frf giving vin details.
My indie charged me £40 to fit and it took about 20mins. Inynoponion, good value for their experience!
Hope this helps
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