Hi gentlemen ... and ladies !
This is the epilog of the story I talked about a few weeks ago...
My old friend HP31E is back to life ! thanks to Jon, from Spain, who is probably well known across the forum I think.
I' m now on heading a huge collection : HP31E + HP11C + TI58 + TI SR40 + (pending) TI58C...
The calculator is now working perfectly, even better than it was at origin - remember it was bugged and never granted a serial number.
Thanks again to Jon !
gilles