Thanks again for replies. Did some checks with switch wafers, but need three pairs of hands as LCD plastic shroud has cracked two lock tabs, which requires one hand to hold lcd in place.
Noted by bridging uA range select resistor (10k) to lower value 5k, moving selector from mA , reset, to uA , display shows uA as normal? Unable to confirm if range code correct or if uA reading correctly as i ran out of hands..
Christmas commitments mean this project will have to go on hold for now.
Seasons greetings to all.