I removed all back cover screws and removed the metal ram cover. I placed thick wads/rolls of tape behind the letter “E” and turned the unit back over with the cover snapped on only. I pressed hard on the E, G, and H. The keys worked. I also put clear plastic tape over the ram cards to prevent electrical shorts. Sometimes while pressing hard on inoperable keys the whole computer would turn off and Id have to disconnect the battery and reconnect it then it would turn back on. It once went into a disk scan with fragment recovery and I had to boot in safemode to get it to work again. It seems the problem is a multi faceted wear and tear problem with the keyboard. Poor design over time results in a disconnect of the E, G, H, and Fn keys. I originally thought that my daughter spilling liquid on the keyboard was the problem but after complete bottom case replacment the problem was fixed for awhile but returned. Then I found flexing the laptop in certain ways caused the keys to reactivate. I have found the proper bracing and stress to place on the backside of the keyboard to get it to work reliably.