What they had seen was instead of the three red undershoot lights at the start of the run at 800 feet and three miles from the runway, they saw the three white overshoot lights. It turned out that in the days earlier when the driver of the vehicle who laid down each light box in the space where the previous lights had been located, he inadvertently put them down for the reverse runway. T-VASIS for Runway 19 instead of those for Runway 01.
I find that a bit hard to believe. T-VASIS boxes were not runway specific. Internally they were pretty much the same, just a system of blades and filters differing depending on their position in the array, but only some had the red filters in. When installing, they were initially aimed using a calibrated aiming board. The possibility that the fly down boxes could have been initially aimed that low is non existant imo, and ditto for the possibility that the fly down boxes were installed in the fly up position. When setting them up it is obvious if they are fly ups or fly downs.