Pull the PCB light board out and look at the header on the board where the connector plugs into it. I'll bet the common pin solder joint is cracked. Reflow the solder to all the header pins and you'll be good to go.

Sometimes you can get really lucky and if there is an IDC connection to that group of bulbs, you'll find that it has simply worked its way too loose to make solid contact.

Reflow and both half circle where each socket make contact.
Next is to trace the wires to where they go/come to see if there is some cut.
If no cut wires then you must check their transistors/ICs.
Had similar problem with T2 where 4 lights didn't show.Their transistors/ICs on Power board were fine.Finally it was IC on CPU board that was bad.

Okay, I'm going to assume this is true and your 3 lane lamps at the top of the machine are working.

I personally like to check the simple stuff first...the Yellow-Orange column wire feeds thru the 3 lanes board connector, the lamp harness will connect from the PDB to the lanes first, then proceed down to the Multiplier board, it's a free check to take a look at that, or just simply measure continuity from J137-3 to the Yellow-Orange wire on the lamp board.
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Edit: Lamp columns could be on either on J137 or J138 and the manual has conflicting information on this...in reality it shouldnt matter which one its connect to as they are electrically identical, this actually makes it easier to check as you can use the pins of the unused connector as test points
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If you cant fix it with this information, my standard repair fee is $95/hr plus parts; the clock starts when I get in my car and ends when I get back home

The last post should be helpful. Good info. The yellow/orange wire daisy chains to all 3 top lanes and to the multiplier board. If one or more of the top lanes light, most likely a broken wire at one of those 3 switches that feeds the multiplier board. Yellow/orange is the only color of wire to be looking at to find the problem.