I take it that your a tech on the project. Don't be afraid to consult the design engineers for help (Send an email if out of reach). They are often happy to assist you in learning the product, and your will learn much from them...
Could you help me out with it?
It would help me to know what DC voltage should i expect on both pins of each crystal.
Moreover, could excessive capacitance cause the crystal to output unsteady frequency?
What could cause this?
Excessive capacitance? wrong DC bias voltage?