Hello again, Carl.
I was unable to reach my friend, however, I left a message for him.
I also searched the site for a TM for your unit. Can't seem to find it here, so searched the web
and came up with the TM attached below.
I don't have much time to read it, but section II [3-1] is a troubleshooting section that might help.
If I learn more that might help you... I'll relay the info.
Good luck.