If you have an IC756PROII version #23 EU-model and want expand the TX range: Read my article placed for IC756PRO and change the diode-row according to "after version 3" mod. You've to remove 3 diodes ( D3752,3753 and 3754).
Your Icom IC756PROII version #23 EU is original like the dioderow "version #03 before modification" that you can read in the article .
The tx-range is 1,6 Mc - 30 Mc & 50 Mc - 54 Mc when you execute the mod.
Download B&B Technical Services Amateur Radio Repair article about this mod. There is more picture in the PDF file.