Genius: I can show you photo taken of the inside of your MBP, see there is sign of rust
Me: (I didn’t see nothing from his small iPhone display), no way!
Genius: you said you turned it on for half an hour after shaking water off didn’t you? That was bad it got short-circuited.
Me: It worked OK except with occasional dimming of display and some funny noises! Then it failed to boot, I’m here for you to examine.
Genius: Well if you want to repair it you’ll need to replace this this … and this, it’ll be $9,xxx 
Genius: it’ll be cheaper if you get a new one?
Me: how much is it for a new one?
Genius: (…fingers flying all over his iPad ….), you don’t need Retina display, what do you do for work? 
Me: mine was top model 2 years ago, I do need 512G SSD, it’s a terrible timing to replace this as model refresh is imminent right?
Genius: no one can tell , we can do data migration for you if you join “one to one” yearly membership for $768. This is your SSD or you can buy a docking for $200 and transfer data yourself.
Me: (it was 8pm Sunday night, I just didn’t want the hassle of shopping for a docking plus a whole night sleep to transfer data myself) I need this for work Monday morning OK?
Genius: OK we’ll do our best  and will start work immediately, in case of trouble during migration someone will call you.
Their repair man rang a while later ..
Repair: we tried to move data across but your new MBP isn’t big enough?
Me: no way, old one has 512G new one is of the same size
Repair: OK we’ll check again
Next morning Monday I got my new MBP 13″ Retina back by about 11am after shouting to a few guys who said their normal delivery is 3~5 days.
Tuesday night I was thinking what to do with the SSD, options are (1) get a case to use it as external drive for backup (2) open up the old MBP to see if it’s repairable.
I saw no rust, no water stain apart from dust near hot air exhaust. As Apple’s gadget is named by specialist as least repairable I dare not tear it down further.
No harm trying to resurrect it as it has been certified dead anyway. I put the SSD back on. I noticed also that there is a loose connection at the left bottom corner, did I shake it off or Apple Genius left it unplugged?
Put the screws back and fired it up. Wow … the display is back on while booting but it didn’t boot up. Pressed power switch for 4 seconds, leave it for a while, tried again.
It’s A.L.I.V.E again! I wrote this from the old MBP.
Let’s learn from their cunning attempts
 if your gadget is out of warranty, they always quote a number near or slightly less than an entry level replacement
 they won’t suggest expensive model of the same line, they want to close the deal
 even if they knew model refresh is a week away they just won’t tell you
 Genius will promise you anything as long as you hand him your credit card
I now have a standby machine for work, Douglas has a “new MBP”. I may have shaken off the display connection or the Genius has never attempted to see if it was bootable?
Just don’t trust Genius if your gadget is out of warranty.