It's possible / likely, that this is because of the Pedal
sticking to the shaft of the bolt that secures it to the frame, due to corrosion.
Squirt some ( LOTS of ) WD 40 into anywhere you can access, where those two parts join,
moving the pedal up and down as you do so, to get as much in there as possible,
and hopefully this will free it off.
That bolt ( Triumph Part T3331400 ) has proved to be troublesome for several Members,
and in extreme cases has sheared off leaving the rider stranded !
NOTE : This part has now been superceded to Part Number T3331520.
The bolt is VERY Tightly secured in place with a "Loctite" type compound,
and cannot easily be undone to lubricate the mating surfaces.
Consequently if the pedal and bolt shaft corrode and "stick" together,
when the pedal is operated - the bolt breaks by shearing at it's weakest point,
right where it enters the threaded hole on the frame, making it difficult to remove

If your Trophy is still under warranty you would be well advised,
after trying the WD 40 application - even if it frees it up,
to get your Dealer to examine it, remove it, clean it up and / or replace it if necessary.
There are plenty of exiting Forum Posts about this :
Sheared gear lever mounting boltGear Lever, and
Gearchange pedal pivotIf it's NOT the pedal sticking to the bolt then it could be
something more serious going on inside the gearbox.
Hope this helps

