Mcquay ALR145C sn 5yh8185401 Problem is one circuit will give me a low evaporator pressure alarm upon start up. Extracted charge and wieghed in specified charge. LLS is energizing on call, suction pressure does not raise above cut in level. No taps between LLS and TXV, how would I determine if I have a faulty LLS or a defective TXV? Cap tube to sensing bulb does not have any visible holes.