Questions to ask the seller-
1.What is currently installed in the printer?
2.How long does this printer sit unused?
3.How old is it?
4.When was the last time it was used?
I am not aware of any way to Power clean individual lines on the 3800, you can purge the lines individually by running QTR flush images through Calibration mode (which can be painfully slow).
If you have the opportunity to put you eyes on the printer, 1st perform a Nozzle check-if it's missing some nozzles, within 2 cleaning cycles it should clear up, if it doesn't then it might need some further investigation.