Rockford Fosgate T1500-1BD

There is no rail voltage in the amp.. Power supply seems to be working Since i have 5 volts on the gate leg and 13 volts on the middle leg and 0 volts on the third leg..

I checked the rail voltage at the Rectifiers (mur1620 and mur1620R) And the voltage pulse's up and down its no steady i puled the rectifiers from the board they test fine..

Should i replace them and see what happens or does anyone have any thoughts on what to check??