These posts scared me to death ... sure hope my motherboard doesn't go. I have a 7550 that I paid a huge amount for in 1996 and use nearly every day since then for 8 to 10 hours. I did have to replace the foot pedal not long after I had gotten it but that is all. Hasn't even been serviced for several years now.
Good to know all of this information. My 7550 was made in Germany.