Has anyone had experience in finding condenser tube leaks? We've tried using helium, but we found it not to be very consistant. Mechanics tried, this last time, to use plastic but a valve was not holding, so they could not get in the condenser. We are looking for a way to get in find the leak as quick as possible and get out. All this is done with the unit on line, but if anyone knows of a way to find the leak with the unit down would be even better.

Thanks in advance

Rafael,
I suggest you contact a local supplier of Ultrasonic equipment or services. This typically works well offline and is quicker than boreoscope inspection.
Hopes this helps,
Tony Sovar.
Disclaimer: These opinions are my own and not necessarily those of my employer.

What type of fluid in the condenser? Eddy current works well for tube imperfections. If its a refrigerant condenser, a trace amount of refrigerant and nitrogen is the accepted practice.