Hi,
I don't know if you monitor this any longer but I have something that might help you with your Leader 3236. I got it from Leader US, it is machine translated from Japanese, it is not much but can help a bit with the alignment. I also have 3236 and I'm struggling to get output level right, it is way lower. Attenuator(s) seems to be working but the RF level is way down. Other functions (the one that I tested/verified) seems to be fine.
I used to look at the blog frequently years back but other priorities took over. In any case, if you need the adjustment procedure I'll be happy to share, as a matter of fact I'll attach it right now. I'm still looking for device schematics diagram and complete service manual, hopefully one day I'll find it.
Regards,
Blagoje