E072 Mutoh RH II> Error CR over current: Control flat cable on the print head, If is good, I think you have crash one of transistor on the driveboard, is A1746 or SC4131, need to replace this.
Use multimeter to control Transistor, if resistance between two foots is ZERO, this is short circuit. also, is necessary to control one resistor near transistor, is must be 43 Ohm, if one of those is ZERO, must to replace.
good luck.