every now and then , i appear ..for getting your support for wich I thank a lot!!

I have been reading many posts on this issue but did not find anything similar problem of mine...or i missed

while riding my 1500 se 1999 ,suddendly i started hearing something buzzing. I thought it was in my ears since it was stable and same tone despite the speed and RPM but when i looked at the voltmeter i saw the value dropping .
First slowly the in few seconds down to 7 volts ..in the same time display dashboard started blinking! immediatelly afterthat votlage came back to normal value and buzzing disappeared !Stared wondering what a hell was going to happen but i kept riding untill we stopped for a coffe and when I was about to start the bike....click!...****! again click ..click!!! no way to leave the place!
I just ppushed the bike and was able to start and luckily reached home.
Today in my garage, i have done some checks according your topics suggestion:
-Battery checked finding full voltage 12,7V
-Relay (the one near by the battery), clicks but can not hear the relay B clicking.
-I meausered the voltage downstream the Relay B when pressing ignition button ...no voltage
-I shorted Realy B and pressed the ignition button when i heard the starter motor to attempt to engage but no spin...in the same time measure the voltage at starter connector finding about 12V
- I tried to bring direct battery voltage to starter motor but nothing happened
-Strange is that, when i again I tried to start the bike by pressing the ignition switch, the realy A did no longer click.
My diagnoses is that probably starter motor went to short for a while and now is gone...it explains the voltage drop but IF relay B is gone...well I have no explanations.
few questions:
Starter motor
- I want to remove the starter motor for checking...any warning?
-to test it, do i need only to supply 12 V to + and - ?
-do you know the starter's coil resistance (ohm)?
-If broken,can starter be repaired?
Relays
- I want to check the both solenoids (relays) how to do that?
- worthy to replace them anyhow?
- Now when the relay A does not click, is there a fuse somehere in addition the 30A "build-in" one?
thanks