Replaced 2 brake boosters, can't learn Linear Offset

This drives me crazy, September 2013 model, got C1391 Abnormal Leak in Accumulator.
I replaced brake booster - no luck, after full brake bleed Linear Offset did not pass. Alright I thought bad part, ordered another one, post recall model #, installed, bled and cant do linear offset. Did with Launch, Thindiag and TIS - all the same. Brake light never blinks fast, it does blink slow for about 110 seconds, and then all 3 lights turn solid, Learning undone. Brakes work fine, but all lights are lit. Only Linear Offset Errors in scan tool C1345 and C1368.
Anyone know what else that might be?