Moisture

Good day dear forum!
The story. A friend brought me a box with simptomami: not included, does not react in any way when you connect the PSU light went out immediately, goes into protect, KZ, respectively. Tried another PSU, same result. Nothing to do, had to be dismantled. The marking on the Board X865012-001 Rev. A-2. Found traces popodanii moisture in the area of the power connector( on-Board square A6 ) where is located the elements of U5A1,U5A2,L5A1. Cleaned, connected 5V to the duty room, C5A4 warmed up, replaced it, now the PSU in protection does not go away, burning orange light, but then the effect is zero. Along the way, decided to change all of the burnt conder, 6 pieces. Later found out that U5A2( B4=21Z), U5A1(the markings not readable), and Q6A3(W29 BCP51) burned and cortili. Asking for your help in identifying these elements, what it is and how analog can be replaced, or Datasheet, search gave me no results. Please do not judge strictly, I'm a self-taught photographer with a soldering iron and Hairdryer are friendly, know basic elements and smd only perceive. Popravte me if wrong, U5A1 and U5A2 is voltage Q6A3 transistor, and L5A1 the throttle?