Hi I am new to the forum and have a problem with my Vectra 1.9 CDTI SXI 120, there is a steel pipe approx 6mm dia running accross the top of the cylinder head with a tee-off that has cracked and looses coolent when the engine is hot and under preasure, what is the best way to repaire/dissassemble this part as it seems to run down the back of the engine and removal appears to be difficult.