Service Bulletin Description:
Threaded area on potentiometer housing breaks on single element gray based potentiometer (p/n 316239604).
This Service Bulletin PDF download contains information for the following:
CPLEFM99EC/A/C/D CPLEFMZ9ECA PLEFM399DC/A/B/C/D PLEFMZ99EC/A/C/D
The PDF may also contain information that applies to additional models not listed.