Lennox G2003E-75-2. Has spark-to-pilot module and seprate sensor rod. It has a pretty blue pilot with good impingement, I cleaned the sensor rod with a soft brass brush and clean white paper, my Fluke reads 1.4 micro amps in series with the sensor. The main valve wont kick in and the furnace goes into lockout. What micro amp reading should I be getting? (I think I have a weak module.) Thanks guys, from a 'retired' tech with a bad memory.