( a3 y6 m$ N6 U0 C ' x" g( x; F* r% q. @9 a0 ~(DIY) buy at HD, apply leak seal from inside OR! t; i7 I- {4 H; U$ F- d( J# w
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hire some professional company that armed with high pressure injection equipments to do the leak plug.
& t+ N6 s- z- \* h6 B1 Oshould work, high pressure injection is the best and have lifetime warranty. 7 O) F0 y. `7 F: a0 \) ]( H5 z& X* e" L% S4 r9 T* r
hairline cracks not going all the way through wall is not unusual, ! ~# ]5 ~5 n' C, o 4 Y+ f2 x* O; y: Z ubig crack is rare, if possible, I rather back off