1979 GTE Sylvania GT Matic CX9164W chassis E24-3

[Alex KL-1]

Probably, it will measure low like the first measurement, since this diode can be in same circuit of the HOT.
Measure using the diode scale on DMM; then, you can desolder it, and check if the low value remains on the part, or in the circuit board (at same PCB location).