Help help help! I installed a Goodman GCH95 95% nat gas furnace for my mom last fall. Somewhere around last april she complained it wasn't keeping house warm and took a video of furnace. It was lighting when tstat called but would go out and relight and repeat. I checked system and found that it would not stay lit after several heat cycles. At that time (april) I found the gas valve wasn't opening everytime it tried to light and replaced the gas valve under warranty. Now (today) I found that it would light for a few cycles and then not at all. Tstat calls, idm starts, ignitor glows, gas valve energizes - and then ignitor drops out without reading any gas pressure on gas gauge. I took a lunch break and came back and same thing - it lit a few times then I can't get it to do anything other than the sequence aboove. Does anyone have a recommendation as what to do next. I jumped all safeties one by one and ohmed all out. I'm thinking maybe control board. I cleaned flame sensor and pulled orifices. All ok. Please help...driving me nuts!!!