If you disconnect the plug you can accurately measure the resistors, put your meter on the 2k range on ohms and put your leads across each one, you should see very close to 1k for each of them. Also have a good luck at those solder joints on the board as well, it's possible the socket has come loose in the past and one of the solder joints has a crack (difficult to see sometimes). We need to get this signal working properly before the diagnosis on the board goes any further but I've also marked some additional green lines on the schematic above. This indicates the signal path from your torch trigger, via the TIL111 and eventually it ends up at pin 5 on the FZJ101, which is the input pin. Once we see a changing voltage at that pin we will know for sure if the FZJ101 is faulty.
Regards
Neil
just did this measurement and the rear one of the resistors has no reading the front one rreads .330