Examined Convection Oven unit, turned off, removed kick plate, turned unit on, got spark, got pilot, got main flame. Customer stated stopped working 3:00 Friday, they shut off tried again. Saturday would not light but could hear spark Note: QWP parts per Mark. 8-10-18 Replaced pilot assembly and gas valve, when shutting gas off to unit found gas line leaking. Customer okayed replacing gas line, installed. and tested, found unit still not always cycling. Main burners on, checked ground wires for module, all tight, replaced ignition module SPARK control and tested okay