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(DIY) buy at HD, apply leak seal from inside OR " J2 ^2 g+ e6 U5 Y+ W9 O& k2 W, c X" C! }3 z2 D* `" T. X; H% ?
hire some professional company that armed with high pressure injection equipments to do the leak plug.
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should work, high pressure injection is the best and have lifetime warranty. 7 @1 P$ M4 k1 B- w1 x# Z Y5 Q j2 y" G9 l
hairline cracks not going all the way through wall is not unusual, & u k9 E: n0 V( O' l7 O# V; n# r9 G1 o
big crack is rare, if possible, I rather back off