Thanks for the photos. I am saying that I am pretty sure that you have the C22 cap, the one on the left in the bottom two photos, round the wrong way.

If you put a voltmeter onto either end of C22 the way you have it, you will see that the cap should be round the other way.

I know the LCIII will work with the capacitor round the wrong way for a while but I am not sure how long.