NO (sometimes NOx) is the chemical formula for oxides of nitrogen. These are produced only when combustion reaches a certain temperature. What was probably cleaned before were the EGR ports. The basic purpose of the EGR system (exhaust gas recirculation) is to keep combustion temps down by displacing some the the incoming air/fuel charge with the already burned gases. The air/fuel mix is slightly less potent. It doesn't burn as hot and thusly limits NOx emissions. An inoperative EGR system causes NOx and sometimes detonation from the higher temps in the combustion chamber.

We don't smog in my area of FL, but the newer vehicles closely monitor EGR function and in my shop we regularly have to trouble shoot the EGR system when they set codes and turn on the check engine light.

It looks to me like your readouts give you three pieces of info for each exhaust gas measured:

max - max allowable?
ave - average vehicle measurement?
meas - measurement for your vehicle
gp - level for rating of gross polluter

It appears that the NO is the only rating out of range, so I'd focus on the EGR.

Sorry for the long post, I hope it's been helpful.

David