Lane A

From my experience first make sure that all sockets on the Fuse box are in place and tight them with ties to make sure always having good contact. 

Sockets and plugs

Coil #2 is the Ignition Coil mounted above cylinder #2.
It energizes the TOP Plugs in Cylinders #1 and #2.

Inspect the Top Plugs in Cyl #1 and #2.
Make sure the plug wires get reconnected properly.

Especially check the connectors from the wiring harness to the Ignition Coil.
These are not the greatest of designs and vibrate loose and/or corrode easier than most other connectors.
Remove the connectors from the Coil. This will require a little disassembly.
"Gently" squeeze the metal socket to increase the contact pressure and apply a light coating of grease to the Coil's Pins.
Confirm that the connectors have a firm grip on the Coil Pins when reassembling.

If all this produces no change,  Try swapping Ignition Coils. They are all the same.
- - -
You will see no difference in flight performance.  This is the reason we have Dual ignition systems.
When Coil #2 Faults, Coil #1 takes over.

This is strange since you would expect to see a lane B light with coil #2 fault.

When the Lane A (or B) ECU is the controlling ECU, It controls all 4 Ignition Coils.
Lane A detected the Misfire in the #2 Coil.  Finders Keepers!!!