efcmandan
The inlet manifold port plate is a commen fault on the ATR, they block up with soot, which eventualy result's in the EML light coming on.
Also commen for the ATR to have tight valve clearances,(especially on the exhaust side) they should be checked/adjusted at 27k/54k/81k services.
So in my eyes the dealer has done a good job mechanicaly wise, obviously their customer care needs work, and the CSA has no idea either, if 4 of the tappet's were completely closed i'd be surprised if it even ran, a little bit of over exaduration me think's
Glad it's sorted though mate