The resistors looked "different". IIRC they turned color & got a bubbly
coating on them. Lift one end & retest them.
Same with transistors not in sockets. Lift 2 out of 3 leads & test with
DVM on diode test. We had a few transistor checkers & they collected dust.
Only one tech used them & he was playing engineer & wasting time.
Bottom line is parts IN circuit very often read bad.
73 Zeno
LFOD !