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Hi. Thanks for your response. PP3V42 is now holding steady. Still 1 fan spin. 0.128V on pin 1 C4920. 3.47V on pin 2 of L4901 and pn1 of C4901. PP3V42 in diode 0.088 with L4901 in place. if I remove L4901 I get 0.338. Thanks