1. A method comprising: receiving printing symptoms relating to an actual printing defect produced by a printing device from a user into a graphic user interface; analyzing said printing symptoms using a computerized device operatively connected to said graphic user interface and to said printing device to produce candidate component defects corresponding to said printing symptoms; creating representative images of example defects by adjusting diagnostic images from a library of diagnostic images illustrating known failure modes, said adjusting changing said diagnostic images to individually compensate for machine age and machine health of said printing device; and outputting diagnostic recommendations containing said candidate component defects to said user, said diagnostic recommendations including an image of said actual printing defect and at least one of said representative images of an example defect corresponding to each of said candidate component defects.