What was found
ANTI-SKID EICAS AND LIGHT ILLUMINATED AT TOP OF CLIMB, FL 390. ALTN ANTI-SKID FAULT MESSAGE ALSO DISPLAYED. LIGHT AND EICAS EXTINGUISHED AFTER 25 MINUTES, ACFT DIVERTED. PERFORMED BITE CHECK IAW FIM 32-42-00. FOUND MESSAGE BOX 4-8. R & R ANTI-SKID AUTO-BRAKE CONTROL UNIT IAW MM 32-42-01-004-001, & 32-42-01-424-042. OPS CHECKED GOOD IAW MM 32-42-01-704-010.