There are 4 oscillators in the PLL and 7.287MHz is the edge frequency for switching between VCO1 and VCO2.
Your VCO1 is therefore not working. The board is CGA131 and known as Loop1.
The VCOs are inside a screening box on that board. I found this out by going here.
http://www.radiomanual.info/schemi/R...D-525_serv.pdf