2018 Expedition with 23K miles would randomly have cam phaser noise. Received the Customer Satisfaction Program letter in the mail. Took the vehicle in and had the 21B10 done. It now sounds different and rattles more than before and more often also got the shudder that wasn't there before. I took it back to the dealer to have them do 21N08 because it was better with the previous programming. Rep said he didn't think they could return it to prior programming and I said this letter says you can. They then tell me that would only fix the shudder and not the noise and suggested I opt for 21N03 and have the phasers done while it's still under warranty as it's about a $4,000 job and that it would take about a week. I can't really be without it that long. I guess I could rent a car but really don't want to. Now, this may be good advice from the service rep to go ahead and have 21N03, but it was better with the as built programming so I don't understand why they wouldn't just try that first? Any ideas or suggestions as to what I should do? My other question is since they won't return to prior program if I have the original profile saved in Forscan is there a way I can do it?