Error 26 in Noise figure meter HP8970

i have HP8970B with error 26 always, Also I have 346b, I have tried to remove the error 26 with it, but with no success, anybody please help to sove the problem. thx.

Battery is lost.
See service manual.
Calibrate IF Attenuator by "33 SP".

Have already replace the new battery and tried with 33.0 and 33.1 Special function, but error remains. May i request the procedure to IF calibration with battery replacement. As i Get Error 80 after putting new batter. If i try to callibrate with 346B, error 26 appears.
Thanks.