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TST older units need a firmware update to fix the high temps phantom alarms when you are around other users. I only experienced them at truck stops and campgrounds. My choices were to sent the old display back to TST for a fee firmware update or just buy a new color display which has much better viability. I chose the new unit.
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Jim & Martha Abernathy
2014 Montana 3402RL Level UP, Sailun S637's, TST 507, 500W solar
2014 Ram 3500 Laramie® 4x2 diesel dually crew-cab 3.73 axle, Reese R20
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