MBE 4000 DDEC VI Troubleshooting – Section 129 SPN 3720 – Ash Level Above Normal Email This Page Section 129 SPN 3720 - Ash Level Above Normal 129.1 SPN 3720/FMI 15 or 16 EPA07 MBE 4000 DDEC VI Troubleshooting Guide - 6SE568 Generated on 10-13-2008