Thanks Guys

my pinball diagnosing is very thorough and I don't charge on an hourly basis. I only charge for the actual repair and I do get the boards repaired ASAP.

when It comes to corrosion repairs and repairing some one else's hack repair jobs on boards it does take more time then just a simple diagnose and repair.

When I do a corrosion repair I remove all corroded parts. then all the remaining solder. sand  the corroded area to remove any remaining corrosion, neutralise the corrosion, tin all exposed copper with solder, mask up all headers seal top side of the pcb with solder through pcb lacquer, install new parts.repair any damaged tracks with jumpers, then seal bottom side of pcb with lacqer, mask any new headers and I.C sockets and re coat top of  board.

It makes me exhausted just typing the process.