James, Jim , i appreciate sharing your experiences & ideas. In our case the front LED on the nosecone did not light red. I can also exclude temperature changes (air conditioned room) and vibration as an option for the failure. An important information would also be whether Foxboro recommends to reuse the replaced FBM or not. Best Regards Rocco _______________________________________________________________________ This mailing list is neither sponsored nor endorsed by Invensys Process Systems (formerly The Foxboro Company). Use the info you obtain here at your own risks. Read http://www.thecassandraproject.org/disclaimer.html foxboro mailing list: http://www.freelists.org/list/foxboro to subscribe: mailto:foxboro-request@xxxxxxxxxxxxx?subject=join to unsubscribe: mailto:foxboro-request@xxxxxxxxxxxxx?subject=leave