I just got off the phone with PSE. They were very helpful and informative...here are the answers I received:
Q: How do you time the TAC 15
A: The same as a standard compound bow by Twisting/Untwisting the buss cables connected to each cam to tune each cam separately.
Q: Is the string adjusted in the process of timing the cams?
Q: I have had inconsistency in windage since I have owned the bow. Would timing affect windage consistency?
A: Yes. Timing will throw the shots off left to right.
Q: I have heard a cracking sound when bringing the crossbow to full draw. Is this sound normal? Is there some lubrication requirement for the limbs?
A: No. The sound is not normal. No. There is no lubrication requirement for the limbs.
Q: Since I'm hearing this cracking sound sometimes, should the dealer order new limbs and replace my old ones.
A: Yes. PSE will replace the limbs under warranty. Also, a cracked limb will also affect accuracy.
Q: The dealer has ordered a replacement string from PSE already. Should he replace the buss cables also since I am going to have the limbs replaced?
A: No, the buss cables should be ok. Once he replaces the limbs and string the crossbow should be able to be timed properly and should shoot consistently.
I hope this info helps you guys.