Faulty Register RS5 in HP-97

[Karl-Ludwig Butte]

Dear All,

I just executed the "Diagnostic Program" from the standard pac on my HP-97 and it showed error code 15, meaning that RS5 is defect. I further investigated and found out, that storing a value in Reg 5, f P<->S, f P<->S, RCL 5 shows either 0 or sometimes -0,66 but never 5 which was stored in the first place.

Does this mean that explicitely RS5 is defect or is another reason possible? Have any of you ever had a similar case and could it be repaired?

Any hint will be very much appreciated.

Thank you very much in advance.

Best regards

Karl