No flash to pass on mine.. it went out about 2 years ago. I got my switch off Ebay from a salvage yard (tested good) for $50. Looks like the biggest issue is torqueing off the steering wheel.
Got this link off another thread..
Mercedes-Benz SLK 230 Turn Signal Stalk and Combination Switch Replacement | 1998-2004 | Pelican Parts DIY Maintenance Article