See my previous post on the topic.  Full press release (including stops for the free bus shuttle) below:

Central Link light rail will not operate between Westlake and SODO stations all day Saturday and Sunday, June 12-13, due to Safety System testing in the Downtown Seattle Transit Tunnel as well as modifications to the OCS wires at Stadium Station.

Sound Transit will run a free bus shuttle between SODO Station and Westlake all weekend. The free shuttle will be marked King County Metro Route 97 and will stop at the following locations:


NORTHBOUND to downtown Seattle, Westlake Station:

* SODO Busway at S Lander St
* SODO Busway at S Royal Brougham Way
* 5th Ave S at S Jackson St
* 3rd Ave at James St
* 3rd Ave at Union St
* 3rd Ave at Pine St

SOUTHBOUND to SODO Station:

* Pine St at 5th Ave
* Pine St at 3rd Ave
* 3rd Ave at Union St
* 3rd Ave at James St
* 5th Ave S at S Jackson St
* 6th Ave S at S Royal Brougham Way
* SODO Busway at S Lander St

The shuttle will run every 5-7 minutes during normal Link hours.

Additionall, all King County Metro and ST Express buses that normally operate in the tunnel will also be rerouted to surface streets.

Link light rail will operate every 10 minutes between SeaTac/Airport and SODO stations on Saturday, June 12 from 5 a.m. to 1 a.m. and every 10 minutes on Sunday, June 13, from 6 a.m. to midnight.