Do they know the proper refill procedure? Simply adding cold fluid to a hot or cold trans isn't always going to do the trick. The fluid need to be at the correct temperature when determining fill level. I can almost guarantee you that was the problem when they did it the first time.
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2011 370Z 6MT Sport Gun Metallic | ARC | CJM | Ecutek | FI | Fujimura | R2C | SPL | Stillen | TWM | Z1 | ZSpeed | |