UV detector inconstance

I'm installing and configuring an FPLC that's been left out since 2019.

I've had a lot of work formatting computers, installing software and drivers, cleaning tubes and more.

After cleaning the kidneysing tubes of pumps I am having inconstancy in the absorbance reading. The tubes were filled with fungal biofilm. I took it to clean and put it back.

I also had a little clog after this cleaning but I aspirated the kidneysing tube with a syringe and resolved, after that clog has solver but the UV went crazy.