blocked nozzels

Somehow I have managed to get air into my light cyan lines. It happened before and I ran the wic reset ink charge and the problem was resolved. Unfortunatly this time most of my carts were almost empty. To empty to run the ink charge so I have been sitting here for the last 4 hours running purge...

My Epson 1290 is around 13 years old now. It's been pretty reliable, but over the last few weeks I've begun to experience more nozzle outs. If I initiate a head clean operation, the nozzle blockages appear to move around - i.e. the nozzles that were blocked become clear, but others that were ok...