Early/earliest HP-41CV halfnut

[AndiGer]

Now I let the calculator sit until it switched off itself - after about 7 minutes.
I changed to decimal separator comma (CF28) and it still behaves normal.
I did some calculations, did change SIZE to 000 and 319 and back to 046.
Changed the battery compartment to a rechargeable HP-82120A - all ok.
Successfully installed Math1 module in each of the 4 ports. Works and everything normal.
Astonishing. Faith healing by my hands or self healing by "let it alone" ;-D ?

Hope it will work in future without further problems.

Andi

PS: Somebody can report he/she has a halfnut of the same age or even older?