The 4m hotfilm (ch3) started reporting suspicious values about 6pm local time last night. It was averaging over 2 V, then dropped off to 0.6, and at the moment is 0.2 V. If it were a broken film, then I would expect the voltage to be at 2.474 V or so, and if the bridge were powered off or disconnected I would expect near 0. A short in the film or in the probe would measure around 7 V. So I'm not sure how to interpret the current measurements. Anyone have any ideas? I suppose checking the film integrity is a good start. Otherwise maybe it's worth switching to a different bridge?