Again, no offense at stating the obvious. The cap and resistor values are correct (as contained in the statement "all three components were replaced with tested new ones").I'd start by taking a step back from it then. Firstly, just make sure the resistor and cap values are correct (again, another somewhat obvious statement but let's rule it out), then I'd move towards the VCF. Check the pins to see if they're working. Are you getting +/-15 V on pins 6 & 8? What does pin 10 tell you? Also - is the VCF still sealed?
The LPF pins are showing what they're supposed to.
I'm putting this thing aside for a few days to work on some other things; hopefully another approach will suggest itself.
Thanks.
~G