Hi,
It's exactly the same as the other post apart from the 3 keys you hold down will be different.
Try:
Turn the power off
Turn to SP
Hold down the 3 keys marked in Red on the picture below whilst turning back on
This will switch the machine into fixed keyboard mode, the keys may be in a slightly different position which is the only tricky part, but you can now log on as engineer, reporgram the missing 2 keys in the same way as normal, then log off and repeat the procedure to switch the machine back to programmable keyboard mode where the keys will hopefully work again.

If you get stuck just let me know.
Regards
Nemesis