What was found
WHILE AIRCRAFT WAS IN FOR HEAVY CHECK, MAINTENANCE REPORTED LEVEL 2 CORROSION ON THE LT I/B SEAT TRACK BETWEEN FRAME 28 & 29. MAINTENANCE REMOVED CORROSION AND INSTALLED SPLICE DEVICES AT FRAME 28 AND FRAME 29 (P/N'S 171-00439-005 & 171-00441-003) IAW E170 SRM 51-10-03, 51-23-04, 51-23-05, 51-23-06, 53-21-10 & 53-00-10/REPAIR 02. AIRCRAFT IS CURRENTLY STILL OUT OF SERVICE FOR HEAVY CHECK COMPLETION.