how do i find a specific transaction i made in the mp

[Alwin Alcott]

at the top of the MP page, click on your name / account / order history

 

you'll have to browse the list there

[Alwin Alcott]

at the top of the MP page, click on your name / account / order history

 

you'll have to browse the list there

[Amethyst Jetaime]

Since most media players are no copy tranfer so they can be deeded to group to work, it is highly doubtful your machine will be replaced.  There is no way to prove you didn't give it to someone else.  Most creators will not replace no copy items especially ones that over a year old.