1997 Buick LeSabre Q&A

1997 Buick LeSabre Question: transmision shift selonoid

trouble code p0740 p0753 p0758 will not downshift to first automatic or go into overdrive. can manualy put in first to take off then shift to drive and trany will shift but not to overdrive. where are the shift selonids and what is required to replace them -
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