First of all, thank you very much for helping me.
Thank you also for informing that you were using the cursors in the wrong way. I learned that now.
Regarding hybrid ICs, I never worked with them. To remove them, and do a cleaning with DeoxitD5, is it necessary any extra care? Honestly they are intimidating, the fear of damaging them and failing to replace them is enormous.
I will wait for your answer on this before I do the cleaning.
I will hope that the problem of my dear 2467B is badly contacted.
Big hug and thank you very much.