An audit released Monday found that a "a significant percentage" of the school system's English Language Learners (ELLs) hadn't received the services they're legally entitled to, such as required courses or a minimum number of instructional minutes.They have also been denied other legally mandated services, the audit found, such as being identified as ELLs through the Home Language Identification Survey, being tested and placed through the New York State Identification Test for English Language Learners,