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"Other units were introduced to service as they arrived and completed testing and services checks and were cleared by the New Zealand Transport Agency. In June 2011, all seven units in service were temporarily withdrawn after problems was discovered in the auxiliary power units of two units.[11] A faulty inductor coil in the APUs caused them to overheat, and the trains were fitted with extra cooling fans and settings for the APU power supply were altered so the trains could continue in service while replacement APUs were shipped out from Korea.
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