T-Mobile 3.1AMP Universal USB Charger Repairability Score: 1 out of 10 (10 is easiest to repair)

Plastic cover was very difficult to remove.

Wires needed to be cut in order to disassemble (needs to be resoldered to put back together).

Contacts are difficult to keep in alignment during rebuilding.

It's clear that T-Mobile did not intend for these devices to be repaired, rather they are intended to simply be replaced.