Well, the TX VCO must operate at the TX frequency. You stated above that the repeater is programmed to TX on 441.975 MHz yet your equipment claims the VCO output was 443.71 MHz. Something's vastly wrong there as it's almost 2 MHz higher than it's supposed to be. If those numbers are correct, it's too high and the steering line is trying to bring it down by being close to zero. Since the synthesizer can't get the VCO where it needs to go, it turns off the TX VCO LOCK LED.
The RX VCO must operate at either 10.7 MHz higher or lower than the RX frequency (I would guess lower). You stated above that the repeater isprogrammed to RX on 446.975 MHz and your equipment claims the VCO output was 437.23, which is almost 10 MHz lower. That difference might be the accuracy of your equipment. If the RX VCO LOCK LED is still lit up, does the station still receive the input signal on the correct frequency? If so, then we can say your equipment's accuracy isn't quite up to the task.
Bob M.