First time solder/desoldering and lubing keys. Up arrow, Home, and End keys no longer work; my concern mostly lies with the up arrow key. When I touch Red A to Yellow B, the keyboard tester registers the correct input. Soldering a jump between those 2 did not work; I'm wondering if I'm supposed to solder Red B to to Yellow B? Touching the B pin to anything did not register any inputs.
Also, I noticed after soldering Red A to Yellow B, touching the Red A to the other 'A' pins (eg the left pins) for the Home + End keys registered them as the correct inputs. So I'm assuming I would probably have to jump the entire column's 'B'/right pins to each other to make it work? Thanks in advance.