Did you try googling V07K140?
No! And I don't know why not. Sigh. Something like 20 years of using the Net, and I still sometimes get caught like that.
Also I forgot that MOVs are generally rated in AC V, and so the "140" couldn't be the voltage, since obviously that would have to be greater than half the rectified mains voltage (240VAC --> around 336V DC. /2 = 168V. ..ish. As you pointed out.
Anyway, something interesting. See partial schematic of the board.
It has a mains input MOV, of reasonable size. And equalization resistors across the caps, though they are tiny 1/4W things which is just begging for one to go open circuit due to voltage stress. (They are OK still.)
So why the extra MOVs?
Possibly because there is an auto mains voltage select circuit for 110/240V operation, using a triac instead of the simpler manual selector switch. The 'module' circuit is something I'm not going to bother tracing out, but it occurs to me that if something went wrong (transient?) and the triac turned on with 240V mains present, this thing would try to charge the electros pair to twice the expected voltage.
Maybe the small MOVs are included for that case?
In which case since this will always be run on 240V, I could just remove the triac, and leave the small MOVs out.