[MRCA] DY-105 Relay K3

[Bill]

The transmitter filament control relay, K3, in my DY-105 power supply 
seems to have developed a problem. The filament voltage has dropped down 
to 3 volts. A "tap" on the relay brings it right back up to 6.3 where it 
ought to be so I believe the contacts to be intermittent.
I have not removed the relay yet, but would like to know if there is a 
replacement out there anywhere or can the relay be opened and possibly 
fixed?
What has been your experience?

Thanks,
                 Bill KA8WTK