[nsp] Input errors on a serial t1 int

[Darron]

Im getting this on a customers 3640 router:

Received 0 broadcasts, 0 runts, 9 giants, 2311 throttles
     1652 input errors, 1065 CRC, 585 frame, 0 overrun, 0 ignored, 2
abort
     51457048 packets output, 955822673 bytes, 0 underruns
     0 output errors, 0 collisions, 3 interface resets
     0 output buffer failures, 0 output buffers swapped out
     4 carrier transitions

When I check my side of the serial int, I dont see any errors...

My Side..

     Received 0 broadcasts, 0 runts, 0 giants, 0 throttles
     0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort
     33796174 packets output, 781141486 bytes, 0 underruns
     0 output errors, 0 collisions, 0 interface resets
     0 output buffer failures, 0 output buffers swapped out
     0 carrier transitions 

However, I am seeing this on my side of the int:

Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 234166
  Queueing strategy: weighted fair
  Output queue: 0/1000/64/234166 (size/max total/threshold/drops) 

Any ideas?