029 fault code?

[fausTVR]

Hello peeps, I thought I'd try asking the great brains of the PH Mercedes contingent.

The car is a 2000 w CLK430 convertible (A208 model?), the SRS light will not reset for the garage tech (non-merc) and is showing an 029 code fault on his reader.

Any ideas what this code denotes please.