If you're not an electronics expert, verify your settings, factory reset it, set it back up, and if no better, send it in... One way to test it is to start with a known impedence of the transducer at a given frequency, then measure the voltage to determine the power output by calculation. Sending 2-3kw down a small wire means it's going to be a high voltage pulse; a carefully chosen resistor network can divide the voltages for easier measurement on an o-scope.