question for HVAC guys

That is the air handler WITHOUT installed heater which should yet have another number

Here's the closest I can find for a manual:

http://hvac-talk.com/vbb/attachment.php?attachmentid=249911&d=1331261139

The diagram page 20 for the blower relay shows a "PCB" and an "FDR" so I don't know if it's a simple delay relay mounted on a PC board or if there's additional circuits on the board not shown.

EDIT just saw your last post. I'd about bet money, Red, that there's a sequencer in there that's getting intermittent. Typical.