Motor/pump unit for hydraulic brake unit does not run or runs continuously - AF42.10-P-6003A

MODEL 220 up to 30.6.01 with CODE (979) Special protection version with CODE (Z07) Top protection 

Damage code	Cause	Remedy
43 121 73	Relay with black housing can stick.	1 Remove, install, replace relay K37 and relay K37/1.
	When the complaint is received, that the motor pump unit does not run, relay K37 and relay K37/1 may be the cause due to the contacts sticking, so that the motor pump unit is permanently under power and the pump motor burns out.	Use relays according to Parts ordering note. Relays are installed at factory as of 07/01. Identification: Green housing