Repairs, maintenance, mechanical issues, or drivetrain parts.

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Sourcing Shimano Di2 6770 Parts

Can anyone tell me where I can source a Shimano Di2 Ultegra 6770 rear derailleur since shimano no longer has replacements and left their customers high and dry?
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new MTB creacking on hard pedaling

When I press down hard on my right foot trying to go fast or up a hill I hear a noise coming from my bike. What is this? Its brand new... If it isn't an easy fix I will take it back. It only happens ...