SRQ annunication on LCD display HP3457a

[pe2ben]

Hello,
After power on the SRQ annunciation on the LCD is marked.
Also a a double beep sounds. After a while even 3 times this double beep.

There is also a ERR annunciation but that is caused by empty battery (already replaced).
I have to send out for calibration but first i will try to solve the SRQ annunciation otherwise i could be the case that these calibration is useless.

Regarding the SRQ annunciation:
The STB? command (reading the status register) turns with 104 (weight i think) but in the manuals i can not  find  clear explanation.
The operational manual (V3)  should clarify these but at that way i can't find a reasonable indication.
It is a little bit confusing.
Also the other manuals leads not to a solution.
Maybe someone can clarify things regarding this to me?
Thanks Ben