HP-41 - port not working

[AndiGer]

Dear aurelio,
Diego asked me to send him some fotos of the I/O block and he found a corroded spot on it. Using a DMM I could confirm the missing thru-contact. I repaired it using a very small metal piece (from soldering tabs) that I tin-plated and soldered with much caution onto the corroded part of the I/O block to build a bridge across the corroded spot.
Good luck!
Andi