Service Bulletin Description:
Some units may have an audible high pitch noise. The noise may be more prominent when the range(s) are in stand-by mode.
This Service Bulletin PDF download contains information for the following:
C2Y366P4T1W2 C2Y366P3T1D1 C2Y366P2T1S1 C2Y486P4T1W2 C2Y486P3T1D1 C2Y486P2T1S1 CGY366P2T1S1 CGY366P3T1D1 CGY366P4T1W2
The PDF may also contain information that applies to additional models not listed.