Since several of your phantom switches involve optos, I'd check to be sure your issues aren't being caused by your 7 opto switch board under the playfield. If an LM339 chip has failed (U1 & U2) it will cause wacky switch issues and can cause phantom closures. To see if that is the problem, unplug the power connector to that board and retest your non opto switches (16, 26, 36, 46, & 66). If those no longer have a phantom closure, the issue is one of the LM339 chips on the 7 Opto Switch board. From what I understand those chips are hard or next to impossible to test, so just replace them both. They are cheap. Use sockets if you replace them. I am curious if switch 36 (left cage opto) also causes a phantom closure, as well as switch 56 (lamp spin). It appears your entire row 6 is affected. Switch 32 is also an opto and you report it is phantom closing switch 41, so I wouldn't be surprised if the issue is a LM339 on that 7 Opto Switch board under your playfield.
If unplugging that board doesn't affect the problem, next go check every switch in row 6. You mentioned that you replaced a broken diode on a switch. Was it a switch on row 6 and did you put the diode on the correct way? The non banded side goes to the switch wires on the outer leg. If you did install it correctly and all the switches look ok, time to get out your meter and test the diodes on the switches in row 6. To test the diodes while installed on the micro switch, first TURN OFF the machine so you don't accidentally short something. Disconnect the center lug wires (should be a quick connect). Put your meter on diode test and put your black lead on the banded side of the diode, red lead goes on the non banded side. Activate the switch and you should get a reading of .4 to .6 volts. Any other reading and the diode is no good and needs to be replaced. Be sure to install them correctly. Swap the leads and keep the switch activated and you should get no reading. Check all the diodes on row 6. The lamp spin switch 56 is a leaf switch. You don't need to disconnect any wires or activate a leaf switch to test the diode. A shorted diode can cause an issue on an entire row or column.
Try that and report back with your findings.