How did you do it? Thinking of trying it myself.
I did mine a few weeks ago after I saw the HP from the pump to the distribution block started to leak took the hose to a local hydraulic shop and had it redone for about $75.00
Perhaps the way to get to it on the 2007 SL55 is easier than other model years but hind sight apart from getting the bolts out between the frame and pump it's not that hard to do.(my opinion)
Hereby some pictures
Last 3 pictures are of the replacement hose used now with 5800 PSI versus 4800 PSI (old hose)