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Just tried it again and now it settles at 14.9
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That sounds rather low for a mains transformer primary, but then looking back at Colin's thread his was about 33R, which also seemed low.
When we ask for a resistance measurement please use the ohms / resistance measurement range on your meter, not continuity. This is because the continuity position on meters does not always indicate the resistance of the circuit under test, although it usually does. Even where they do indicate resistance they often only indicate up to several hundred ohms and then indicate Overload / Infinite, whereas if the resistance is higher than expected, we need to know what the resistance really is.
Next one: With the unit still unplugged from the mains and the unit's mains switch turned on, measure the resistance between the black wire on the filter and the metal chassis of the drive unit, and the resistance between the white wire on the filter and the metal chassis of the drive unit.
Both readings should indicate Infinite / Overload, although there may be a brief flash of low resistance at the beginning of each measurement as the capacitors in the filter charge up.
If the above readings are OK make up a three core mains lead with a plug on one end and stripped ends at the other and immediately fit a three-section piece of terminal block to those stripped ends. Check the value of the fuse in the plug and if it is not already 3A, fit a 3A fuse, this is important as it will limit the size of the bang / the extent of the damage if anything goes wrong.
Disconnect the black, white and earth wires currently going to the filter and connect them, via the terminal block, as follows:-
Mains cable live (brown) to black wire which went to filter.
Mains cable neutral (blue) to white wire which went to filter.
Mains cable earth (yellow/green) to earth wire which went to filter.
Disconnect the low voltage output connector from the drive unit's PCB and turn the unit's power switch to ON.
Choose a switched mains socket, set it initially to off, plug the mains plug into the socket and switch the socket on. This is so that if something does go bang you won't be hunched over the top of the unit when it does.
If nothing bad happens, switch off at the mains, reconnect the low voltage connector to the drive unit's PCB and switch on at the mains again and see what happens.