No diode effect measured. Resistance between each of the 6 pairs of "probes"
is 100K ohms. This, of course, is the measurement of the parallel SMD
resistor.

A correction: R1, R5, R6 measure 100K; R2, R3, R4 measure 200K. This is true
of 2 different PCBs (the "subject" printer and a used spare), both from
printers with the same error code.

Maybe a manufacturing error (ie, these were supposed to all be the same
value)?

Ideas?

Thanks.