The Voltage measured is ok. A working regulator should charge between 13,5 and 14,8 Volt.
So in my opinion yours is ok. Have you tested it with all users on? Lights, Grip Heating, brakes lights? How far does it drop? If it doesn't go below 13,5 then in my opinion the rectifier is ok.
Somethings is draining your battery while the bike is off. That's what you'll have to find. Best is to unplug one after the other and keep checking with Amp Meter.
Greets
Claudio
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