SUN-1000GTIL2 and SUN-2000GTIL2 pv input voltage out of calibration

Hi all, i have one SUN-1000GTIL2 and one SUN-2000GTIL2 for a couple of years and first was the 1000 and now the 2000 to they are reading high input pv voltage and get outside the operating value. Is there any way to calibrate them or another method to lower the values to allow initialization?

Very grateful for your help

Cam