Check the mA measuring circuit in standby against oscilloscope
screenshot ma_pulse.pcx.
Might be logged at the end of an initial kV problem in combination
with 02HG + 02HH + 02HX
or other 02xx entries. If kV already disappeared during mA measurement
one should ignore 03PA and look at the kV problem first.
Otherwise the filament or the cathode cable might have a short
circuit. Then expect 03PF in combination.
If in installation check if HT cables anode and cathode side are
interchanged on tank or tube side.
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