Assumption:

• the data after __DATA__, were what you have in your array variable named @check
• You have only T1 interface in your data

If true, then try this:

use warnings;
use strict;

my $host      = "";
my $interface = "";
my $PRIList   = "";
my $T1List    = "";
my $T1Count   = 0;
my $PRICount  = 0;

my @check = grep { chomp $_; $_ } <DATA>; 

for (@check) {
    if (m{([0-9]/[0-9]/[0-9])$}) {  
        $T1Count++;
        $interface = $1;
        $T1List .= $interface . "\n";
    }
    elsif (m{pri-group}) {
        $PRICount++;
        $PRIList .= $interface . "\n";
    }
}

if ( $T1Count > 0 ) {
    print "T1 Controller Summary:\n\n";
    print "$T1Count total T1 interfaces\n";
    print $T1List;
    print "$PRICount total voice PRI(s)\n";
    print $PRIList;
}
else {
    print "No T1 interfaces found";
}

__DATA__
controller T1 0/0/0
  framing esf
  linecode b8zs
  cablelength long 0db
  pri-group timeslots 1-24
 controller T1 0/0/1
  framing esf
  linecode b8zs
  cablelength long 0db
 controller T1 0/1/0
  framing esf
  linecode b8zs
  cablelength long 0db
 controller T1 0/1/1
  framing esf
  linecode b8zs
  cablelength long 0db
[download]

OUTPUT:

T1 Controller Summary:

4 total T1 interfaces
0/0/0
0/0/1
0/1/0
0/1/1
1 total voice PRI(s)
0/0/0
[download]

NOTE: Please, the script above apply to OP originally modified script starting from the for loop.
Hope, this helps.

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