After a quick examination it was clear to see that there was a bit of 'play' at the pivot points on the left and right supporting arms, suggesting that some of the bushes had perished over the years.
I ordered some new ones plus a bunch of clips as I knew that I had to remove the protective grill to get access, and those original clips tend to break as you have to 'work' them off.
A blanket or cover is always a good idea to ensure you don't lose anything into the engine bay. Simply remove the 8 clips that run around the perimeter, undo the 2 screws of the plastic guard that covers the mechanical parts, and unclip the spoiler blind to free the protective grill.
All that was left to do was to put the protective grill back in position. With a socket simply press fit the new clips onto the plastic clamps.
One retractable spoiler restored back to it's former Zuffenhausen glory!