Clean up area motor and filter motor. Measure vibration-noise-temperature of FS and LS. Add grease motor for 15 times and 10 times for FS and LS motor. Check at ER3 and ER4 for RPM-Voltage-Ampere-Temperature for 423 FN1-363 FN1-363 FN2-363 MD1-443 FN1 write at chek sheet form Note area 363 MD1 inside CB room very dirty of dust. Advice clean up employee not  use high pressure near filter 363 FA2 will make easy dirty of dust ( EDI & ADI )