As you answered me that your PCB maker never have In-circuit test (ICT) machine to test their product.
(Measurement tools : Refers to https://en.wikipedia.org/wiki/In-circuit_test)
My question;
How did they know which PCB is OK or NG part?
Answer : Yesterday we have inform to QC E-lead Thailand for contact with supplier PCB Maker about data ICT machine for confirm parts before send to e-lead Taiwan.
OK. Please check and confirm your PCB maker has any machine for checking or not? And does their checking detect kind of this issue?