Report "I have a Dura Ace Di2 first generation and after 2000 km of riding have learned by my bicycle repairman that i have to pay about $160 to replace an electronic relay which I have to buy with the battery pack holder ( which I don't need). The problem which forces me to proceed with this totally unexpected surprise is caused by the fact, that when I change speed on the back derailleur my chain on the bigger front plateau the minute i press to change speed the system changes the chain from the larger to the smaller plateau without. I am told this is not covered by Shimano really not satisfied that after paying so much money for a state of the art system i get such an unpleasant surprise!"