I'd leave the ceramics in circuit as any low Ohm reading across them is bad news anyway
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I was guessing they were safety resistors
@Oily but it's a bit of a strange looking power supply anyway. Sometimes special wirewound resistors are used as fuses as they fail less catastrophically than normal ones.
If you isolate one of the supplies by taking the bridge rectifier off it will give you more of a clue. It looks like this below. There are a few supplies on that board judging from the silkscreen next to the testpoints.
View attachment 126045
The MELF diodes are probably rectifiers for another couple of supplies to the right middle and they look like this:
View attachment 126046
You could take all three of those off just to save blowing anything up further just to see if it is something closer to the input.