Z AXIS JUST QUIT WORKING

I HAVE A RETRO FIT BRIDGEPORT TYPE MILL, SONY NU20/30 CONTROLER.
MITSUBISHI MELSERVO MR-J2-20A1 FLASHING A.37.

WAS WORKNING PERFECTLY ONE MINUTE, AND THEN JUST QUIT RUNNING THE Z AXIS. THERE ARE NO ALARMS ON THE CONTROLER, AND IT STILL READS THE SERVO MOTOR. JUST NO POWER.

MITSUBISHI WEBSITE:
A.37 PARAMETER ERROR- PARAMETER SETTING IS WRONG.
1=SERVO AMPLIFIER FAULT CAUSED THE PARAMETER SETTING TO BE REWRITTEN. ACTION= CHANGE SERVO AMP

2=REGENERATIVE BRAKE OPTION NOT USED WITH SERVO AMPLIFIER WAS SELCTEDIN PARMETER NO.0. ACTION=SET PARAMETER NO.0 CORRECTLY.

SO,WHERE TO START. WHAT DOES THIS MEAN, REPLACE THE SERVO AMP?HOW DO I REPROGRAM THE SERVO AMP? ANY HELP IS GREATLY APPRECIATED