2012 HOLIDAY RAMBLER AMBASSADOR Engine Problems

WE WERE DRIVING OUR HOLIDAY RAMBLER AMBASSADOR 2012 36 FOOT DIESEL MOTORHOME ON A TRIP. AT THE END OF A DRIVING DAY, A WARNING LIGHT (REGEN) CAME ON. TRIED TO RUN A REGEN PER THE MANUAL, BUT CONDITIONS DID NOT ALLOW. THE NEXT DAY, STARTED FINE, NO WARNING LIGHT SO CONTINUED TO TRAVEL. AFTER LESS THEN A MILE, THE LIGHT CAME ON, THE ENGINE STOPPED AND WOULD NOT RESTART. HAD TO BE TOWED OVER 50 MILES TO A REPAIR LOCATION. AFTER SOME TRIAL AND ERROR, FINALLY GOT A QUALIFIED DIESEL MECHANIC WHO DETERMINED THE PROBLEM. HE REPLACED 3 DEFECTIVE PARTS; THE EGR VALVE, EMI VALVE AND KT VALVE (AFTER ONLY 28,000 PLUS MILES ON OUR INTERNATIONAL DIESEL ENGINE!) THE MECHANIC WAS ABLE TO PROPERLY RUN A REGENERATION AND WE WERE ONCE AGAIN ABLE TO TRAVEL. OUR EXTENDED WARRANTY WE PURCHASED OF COURSE CLEVERLY INCLUDED THE 'EMISSION COMPONENTS' IN THE EXCLUSION...