Audio system fails to mute when incoming phone calls received - AF82.85-P-6010A

MODEL 163.113 /154 /172 /174 #A as of 221506 up to 289564, 163.113 #X as of 734088 up to 754619 with CODE (352a) COMAND operating and display system with CODE (353) Audio 30 APS with CODE (756b) MB Audio 10 CD radio with TP/RDS with CODE (819a) CD changer with CODE (854) MB portable cellular telephone 

Damage code	Cause	Remedy
	Software error in CD changer.	1 Inspect CD changer part number
	On vehicles equipped with Code 352a, 756b or 353 in combination with Code 819a and 854 the audio system may sporadically fail to auto-mute when incoming phone calls are received.	If equipped with part number: 163 820 15 89  , then ↓
		2 Replace CD changer See parts ordering notes.	AR82.64-P-7507GH