Just a comment re diode testing. In my experience using a DMM's resistance range is not a particularly good way of testing diodes.
In an earlier post the OP indicated that he has a Fluke DMM. These have a diode test facility which would be better for testing the diode. I posted a link to a post showing pictures of a Fluke DMM being used to test a diode. I also said that this test should be done with the unit powered down.
https://www.vintage-radio.net/forum/...ad.php?t=42194