The unit was installed in 2004 and the dealer has since went out of business.
The blower motor is a GE ECM 2.3 Motor. I have read their literature regarding grounding the blower housing to the ground on the input voltage line. This appears to have been done.
I used an AM radio and found that the noise was strongest near the thermostat and return air area. I accessed the attic and placed the radio near the thermostat wires and the noise was much stronger at that point than the cabinet that houses the blower motor. Apparently, the thermostat wires are picking up the RFI or EMI and carrying the noise down to the thermostat which is just outside my radio room.
Short of running shielded thermostat wire is their a choke or filter that I can install on the thermostat wire?
Just a footnote. Even though I hear the noise through the receiver and the volume is reasonably loud it does not move my S-Meter.
Thanking everyone in advance for their comments and assistance.