Would appreciate any comments on the following. My 2003 SL500 SRS light stays on each morning after start for 15 or 20 minutes. After going off it stays off for the rest of the day (6 to 8 hours) after subsequent starts. No malfunctions noted on vehicle dash display. MB dealer found no error codes and claims that this is common for the model and not a safety issue. Any familiarity with this issue?