I have Service Measure B65 209 04 which identifies the problem with the BM53 radio, nav, and DSP interfering with each other. (Radio Service Measure) Unfortunately, the listed replacement radio module - 65 12 4 135 562 - doesn't seem to be active anywhere. My dealer has given me two or three different part numbers, some radios, some not, and none match the P/N that others have given me that fixed the problem for them. Anyone know the right part number? I have 65 12 6 988 276. The dealer's latest try is 65 12 6 902 718. I see that part number, but it's listed as discontinued in 2001 from my (non-BMW) source.