found Convection Oven unit not reaching set point temp. Checked components, found all fans working. Found temp regulating valve not opening, will obtain new and return to replace. 11-2-17 shut unit down and replaced valve. Found would still heat slow, set point at 515*F, customer stated only need 450*F. Unit heated to 450*F after adjusting fan and gas pressure to 10"wc. Unit cycles at 450*F, customer ran pizza in unit, found temp drops to 430*F. Pizza came out ok, customer will keep an eye on unit, it is ok at this time.