Blower control module

[max76]

Hi guys,
I have a problem with a 1990 l98 vette.
After a run of 10 km...I back home and stop the engine.
The fan of climate always on, also with engine off and the key out of the cluster.
I understand that the problem is the blower control module, I change it with my 1990 zr1 and the problem is disappeared.
So, someone of you know how to repair/test the control module?
Someone have one for sale?
The part number is: delco 16061602 stk6994j
Thanks