If memory serves me correctly, it was British Airways which was involved in a similar incident many years ago.
A foreign object (manual?) had been left just forward of the thrust quadrant prior to departure. When the TOGA switches were pushed, the thrust levers advanced and the reverser knobs struck the object pushing them upwards.
There is a mechanical interlock which prevents the reverse levers moving upwards to reverse idle with the forward thrust levers more than a few degrees from idle. However, the reverse levers do move upwards a little bit (6 degrees or so). This is enough to trigger the first set of switches for reverser activation (
and the LE flaps). Or rather, it used to be. An Airworthiness Directive and an associated Service Bulletin (SB 747-27A2356) was raised to modify/change some components to make the activation of this first switch set occur at 10 or so degrees rather than 6 degrees. The reverser levers will not physically move to 10 degrees with the forward levers out of idle.
Can't find the link I was looking for, but the following is related to this incident:
Airworthiness directives: Boeing, - Federal Register, November 25, 1998 (Nbr. Vol. 63, No. 227) - vLex
Rgds.
NSEU