My same symptoms are - after starting charge, Red light is on, then second light turns On. Then for a long time nothing happens. And later I have all three LED flashing.
I replaced battery and nothing changed.
Imeasured Power Supply voltage and found it 24.2v instead 28v as it stated on the label.
I opened it up and found that the three-lid chip marked 431 is faulty.
431 is a voltage shunt, which sets and controls output voltage.
You can use AIC431CUS or TL432 (TL431 has different pinout).
I replaced mine and volatge back to 28.25v and charger is now working as it should.
You can also use any TO-92 431 chip - there is enough room for it.
Good luck!
Read my other posts on the faulty transistor pickup on here,,cheers lee.
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